Who's the birther now? President Obama took time out of his busy schedule to wish a Happy 90th birthday to beloved comedian Betty White - but he doesn't quite believe she's 90 years old.

In a taped video message that aired on NBC Monday night, Obama's voice is heard while he writes a letter.

Dear Betty, You look so fantastic and full of energy, I can't believe you're 90 years old. In fact, I don't believe it. That's why I'm writing to ask if you will be willing to produce a copy of your long-form birth certificate. Thanks. Happy Birthday, no matter how old you are, Obama said.

The skit was a part of a special NBC aired 8 p.m. Monday night called Betty White 90th Birthday: A Tribute to America's Golden Girl. Celebrities like Mary Tyler More, Tina Fey and Morgan Freeman partied with White and gushed over her comic genius. Watch the video below: