Justin Timberlake attends Marine Corps ball

Justin Timberlake is a man of his word!

1. More Entertainment stories
   1. Autistic ballerina dances her way into hearts
      

      In a popular YouTube video, the beaming little ballerina dances an entire four-minute routine seemingly perfectly, matchin...

   2. Every on-screen drink in 'Mad Men' in 5 minutes
   3. See the 'Dancing' stars' most memorable moves
   4. Emmy's biggest snubs? Cranston, Hamm, more
   5. 'Toy Story' toys burn up in prank on mom

On Saturday, the 30-year-old singer-actor attended the Marine Corps Ball with Cpl. Kelsey De Santis in Richmond, Va. 

PHOTOS: JT's style evolution

He wrote on his website that the event "turned out to be one of the most moving evenings I've ever had." 

As for De Santis? "She seemed to be so humble and honest ... Very cool," he wrote. "She also simultaneously seemed like she was nervous about the whole evening and if I was going to enjoy myself ... I have to tell you, it's not every day that I meet a 23 year old girl and she's more worried about if I'm having fun or if I'm comfortable! It hit me all of a sudden that these were the type of people that look after us and our freedom ... Humble, concerned for others before themselves ... This was the type of person our Marine Corps was building. I was really blown away."

WTVR.com: Attendee captured photo of Timberlake at the ball

A video montage of Pearl Harbor, World War II and the Sept. 11, 2001, attacks "almost brought [Timberlake] to tears." He wrote that it was "a surreal moment to be in that room with so many of our great Marines who have such a different type of connection to those stories."

How did Timberlake end up at the ball? In July, his "Friends with Benefits" costar Mila Kunis was first invited to the Nov. 18 Marine Corps Ball in Greenville, N.C., by Sgt. Scott Moore. The marine made a YouTube video asking Kunis, 28, to be his date to the fete.

PHOTOS: Justin and more southern superstars

After Timberlake encouraged Kunis to accept Moore's invitation, De Santis followed suit, also inviting the "In Time" star to a Marine Corps ball via YouTube. "If you can't go," De Santis said in the clip. "All I have to say is cry me a river! Hit me up." 

PHOTOS: Stars' good deeds

When asked at a Cancun press conference this summer whether he intended to attend the ball, Timberlake said yes. "But not because she shouted out one of my songs, which I do love," he said. "And not because she had all those beefcake military guys behind her to try to intimidate me — although that probably would have worked by itself. I don't get asked out ever! So I was very flattered by that."

PHOTOS: All the ladies JT's romanced!

Timberlake wrote that he was "proud to be [at the Corps Ball]" and "felt like I was getting a chance to be among my heroes. It's funny too because a lot of them are SO younger than me." 

"I've met so many of my heroes — from Michael Jordan to Michael Jackson — and nothing makes me feel more honor and pride than when I get to meet one of you," Timberlake added, referring to those who serve. "Last night changed my life and I will never forget it."