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Courtesy: Warner Bros.

When you're Ellen DeGeneres, it's kind of expected Hollywood A-listers will turn up for your surprise bday party.

DeGeneres is celebrating the big 5-3 on Wednesday's Ellen, and you won't believe what the lucky lady got!

The celebration kicks off when a super preg Pink surprises the birthday girl onstage to serenade her with a personalized song. Then Julia Roberts drops by to give our favorite funny lady a fancy necklace, while Colin Farrell brings an extravagant birthday cake and a T-shirt with a photo featuring the sexy Irishman kissing Ellen. Let's hope Portia doesn't get jealous!

Last but not least, one of DeGeneres' favorite bands, One Eskimo, surprises her by playing one song of her choice! Fab!

For us regular peeps, this sure sounds like one heck of a birthday party!

Check out a sneak peek at Ellen right here: