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Al Roker, Natalie Morales and Tamron Hall helped their friend and TODAY co-anchor celebrate the milestone day with his favorite cookies from Helen's Kitchen and gifts from 1975, the year of his birth. They even convinced Brooklyn-based DJ Mick to spin a few sick beats for Willie.
Savannah, who's visiting her birthplace with her mom, got in on the birthday fun too — with a little help from a group of Australian cheerleaders who sent Willie greetings from Sydney.
Other celebrities such as Jane Krakowski, Nick Offerman, Brooke Shields and Chrissy Teigen got in on the festivities by sending Willie their best wishes for the big 4-0.
And you can join in on Willie's celebration too: Tweet your birthday wishes to our over-the-hill anchor using the hashtag #WG40!