The Insider.com

Last night, NBC's star-studded tribute to Betty White aired on the eve of her 90th birthday and saw countless celebs (Hugh Jackman, Amy Poehler, Joel McHale, Mary Tyler Moore, Carol Burnett, Zachary Levi, Ellen DeGeneres, Tina Fey, Tracy Morgan, Morgan Freeman and Ray Romano) offering her well-wishes while also lightly roasting the living legend.

• January 13, 2012Watch Brad Pitt's Laughing Fit
• January 13, 2012Fallon's Funny Tim Tebow, David Bowie Mashup
• January 13, 2012Kristen Bell Mocks Her Bust
• January 11, 2012MaKenzie Is Back!!!
• January 10, 2012Anderson Cooper + Shake Weight = Giggles
• January 07, 2012Jimmy Fallon's Russell Brand Reads 'Us Weekly'

MORE: 30 Fun Facts About Betty White

But perhaps the best, and most unexpected, joke came from President Barack Obama who taped a special message to the birthday girl.

Sitting in the Oval Office, Obama is seen writing out Betty's birthday card and wondering, via voice-over, how she can actually be 90-years-old. That question turns to accusation as Barack pokes fun at his haters before rocking out to the Golden Girls theme song. WATCH!