Happy 50th, Matt!

Dec. 28, 2007 at 11:48 AM ET

Matt's got a big birthday on Sunday -- his 50th!

In honor of the milestone, the AARP presented Matt with an official membership card, and some old friends -- including former co-host Katie Couric, Nightly News anchor Brian Williams and actress Julia Roberts -- sent their birthday greetings.  WATCH VIDEO

Even though she's on vacation, Meredith passed along her birthday wishes for Matt...and Matt sent them right back.  It's also Meredith's birthday on Sunday!

So how will Matt be celebrating the big 5-0? According to the birthday boy himself, he's got a low-key day planned-- celebrating the big day with his wife and kids.