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Michelle Obama, here launching a "Let's Move!" challenge on the South Lawn, will host an event Tuesday in D.C. with British first lady Samantha Cameron.
By
TODAY contributor
updated 3/13/2012 8:31:00 AM ET 2012-03-13T12:31:00

Michelle Obama has been tapped to lead the American delegation into the 2012 Summer Olympic games in London.

The first lady will head up the U.S. group of athletes and dignitaries traveling to London for the games, which will be broadcast on NBC from July 27-August 12.

Story: First lady greets surprised tourists at the White House

Tuesday, Mrs. Obama is kicking off the sporting celebration with a "mini-Olympics" at American University, where she will host British first lady Samantha Cameron, who is in the U.S. with her husband, Prime Minister David Cameron, on a two-day diplomatic trip. Washington D.C.-area children will take part in the event, which promotes the first lady's "Let's Move!" initiative.

Story: Michelle Obama on 'punching' Al: 'I didn't mean to hit him that hard'

The kids' competition also serves as an opening hurrah for the Summer Games, which will see Mrs. Obama greeting Mrs. Cameron again. She follows in the footsteps of previous first ladies, including Laura Bush, who led the U.S. team at the 2006 Winter Olympics, and Hillary Rodham Clinton, who headed the U.S. group at the 1994 Winter Olympics.

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Photos: Michelle Obama’s effortless style

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  1. Michelle Obama’s effortless style

    The first lady looks as sophisticated in designer dresses as she does in outfits from J. Crew. Take a look at her great style:

    Michelle Obama, wearing a a Michael Kors optic white dress, speaks during a talent show at the East Room of the White House May 20, 2014 in Washington, DC. (Alex Wong / Getty Images) Back to slideshow navigation
  2. Silver lining

    Michelle Obama, wearing a festive shirtdress, hosts the annual Mother's Day tea to honor military mothers at the White House May 12, 2014 in Washington, DC. (Chip Somodevilla / Getty Images) Back to slideshow navigation
  3. Giving the bold shoulder

    Michelle Obama wears a white Marchesa gown with a drop shoulder strap at the annual White House Correspondent's Association Gala on May 3, 2014. (Olivier Douliery / Pool / EPA) Back to slideshow navigation
  4. Berry beautiful

    Michelle Obama smiles as she answers questions during the White House's annual "Take Our Daughters and Sons to Work Day," on April 24, 2014, wearing a Sophie Theallet cardigan and leather and chiffon skirt. (Evan Vucci / AP) Back to slideshow navigation
  5. Fashion forward

    First lady Michelle Obama wears a colorful wrap dress and sits with Jill Biden, wife of Vice President Joe Biden, and Maj. Gen. James McConville at a jobs fair for military members and spouses at Fort Campbell, Ky. on April 23, 2014. (Mark Humphrey / AP) Back to slideshow navigation
  6. Keeping it casual

    Wearing a plaid blouse and black pants, the first lady walks her dogs Sunny and Bo on the South Lawn of the White House at the annual White House Easter Egg Roll in Washington on April 21, 2014. (Pool / Getty Images) Back to slideshow navigation
  7. White House, white dress

    Dressed in all white, Michelle Obama and President Barack Obama depart from the White House in Washington on April 20, 2014 as they head to Easter services at St. John's Episcopal Church. (Yuri Gripas / AFP - Getty Images) Back to slideshow navigation
  8. Rappin'

    Michelle Obama and hip-hop artist Bow Wow hold a forum with high school students at Howard University in Washington on April 17, 2014. Obama rocked a maroon pantsuit and black flats. (Jonathan Ernst / Reuters) Back to slideshow navigation
  9. Classy for a cause

    The first lady wears a simple black and blue striped skirt paired with a white top and matching shrug to speak at the Lyndon B. Johnson Presidential Library in Austin, Texas, during a civil rights summit on April 10, 2014. (Brendan Smialowski / AFP - Getty Images) Back to slideshow navigation
  10. In mourning

    President Barack Obama and First Lady Michelle Obama leave after paying their respects during a memorial service at Fort Hood in Texas on April 9, 2014. (Brendan Smialowski / AFP - Getty Images) Back to slideshow navigation
  11. Gettin' dirty

    First Lady Michelle Obama gets down and dirty in a tunic, pants and trenchcoat while planting oats with students at the White House Kitchen Garden at the White House in Washington on April 2, 2014. (Susan Walsh / AP) Back to slideshow navigation
  12. Radiant in red

    First lady Michelle Obama, wearing a red Alexander McQueen gown, posed with her mother Marian Robinson during a visit with Chinese President Xi Jinping and his wife Peng Liyuan at the Diaoyutai State guest house on March 21, 2014 in Beijing, China. (Andy Wong / Pool via Getty Images) Back to slideshow navigation
  13. Ping-pong fun

    Michelle Obama plays table tennis at the Beijing Normal School, a school that prepares students to attend colleges overseas, in Beijing, China on March 21, 2014. (Andy Wong / AP) Back to slideshow navigation
  14. Welcome to China

    Michelle Obama waves as she and her daughter Sasha leave their plane at Capital International Airport in Beijing on March 20, 2014. (Alexander F. Yuan / Pool via AP) Back to slideshow navigation
  15. Green day

    Vice president Joe Biden, first lady Michelle Obama, and Irish Prime Mininster Enda Kenny's wife Fionnuala O'Kelly smile during a St. Patrick's Day reception in the East Room of the White House on March 14, 2014. (Ron Sachs / Pool / EPA) Back to slideshow navigation
  16. We're green with envy

    Kermit the Frog is welcomed by Michelle Obama, who is wearing a printed Diane Von Furstenberg wrap dress, at a screening of Disney's "Muppets Most Wanted" on March 12, 2014 in Washington, DC. (Win Mcnamee / Getty Images) Back to slideshow navigation
  17. Seeking shades

    President Barack Obama and Michelle Obama make their way to board Air Force One before departing from Homestead Air Reserve Base in Homestead, Florida on March 9, 2014. (Mandel Ngan / AFP - Getty Images) Back to slideshow navigation
  18. Pretty prints

    Michelle Obama delivers remarks during s workshop titled "I'm Every Woman: The History of Women in Soul" with (L-R) Grammy Museum Executive Director Robert Santelli, and music artists Melissa Etheridge, Janelle Monae and Patti LaBelle in the State Dining Room at the White House March 6, 2014 in Washington, DC. (Chip Somodevilla / Getty Images) Back to slideshow navigation
  19. Jump to it

    Michelle Obama sports a chic black jumpsuit during an interview with Jimmy Fallon on Feb. 20, 2014. (NBC; Getty Images) Back to slideshow navigation
  20. Pretty as a painting

    Michelle Obama, in a bold print skirt, is escorted by Rose Cameron, CEO and founder of WAT-AAH!, a line of bottled water targeted to kids and teens, as they view the "Taking Back the Streets" art exhibit at the New Museum in New York on Feb. 20. (Richard Drew / AP) Back to slideshow navigation
  21. Snow bunny

    Michelle Obama skis at Buttermilk Mountain in Aspen, Colo. on Feb. 15. This is the third year in a row that Michelle Obama has vacationed in Aspen over the long President's Day weekend. (Chris Council / Getty Images) Back to slideshow navigation
  22. Ultimate elegance

    President Barack Obama and Michelle Obama, in a dramatic Carolina Herrera ball gown, arrive at a state dinner at the White House on Feb. 11. The dress featured a sheer black top with hand-embroidered and beaded appliques and sleeves that dipped just below the first lady's elbows. (Jewel Samad / AFP - Getty Images) Back to slideshow navigation
  23. Lady in red

    First lady Michelle Obama wears a ravinshing red Thom Browne coat and, along with French President Francois Hollande and President Barack Obama, waves at the balcony of the White House on Feb. 11. (Alex Wong / Getty Images) Back to slideshow navigation
  24. Deep green

    Michelle Obama, in a hunter green Azzedine Alaïa dress, waves next to U.S. Army Ranger Sgt. First Class Cory Remsburg, who was injured while serving in Afghanistan, prior to President Barack Obama's State of the Union speech in Washington on Jan. 28, 2014. (Joshua Roberts / Reuters) Back to slideshow navigation
  25. Vision in blue

    First Lady Michelle Obama smiles as she listens to President Barack Obama speak at an event on expanding college opportunity in the South Court Auditorium of the Eisenhower Executive Office Building in Washington on Jan. 16, 2014. (Mandel Ngan / AFP - Getty Images) Back to slideshow navigation
  26. Bold bling

    Michelle Obama wore a festive lucite necklace while speaking about education in underserved communities in the State Dining Room following a screening of the movie "The Inevitable Defeat of Mister and Pete" at the White House on Jan. 15, 2014. (Saul Loeb / AFP - Getty Images) Back to slideshow navigation
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