All the Celebrities Who Celebrated Selena Gomez’s 21st Birthday

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Instagram (@selenagomez)It was a week-long birthday celebration for the one and only Selena Gomez. (She just turned the big 2-1 after all. You gotta do it up big!) First, she kicked it off with friends like Lily Collins, Chord Overstreet and fellow end-of-July-birthday buddy Julianne Hough, along with a new music video (watch "Birthday" here). Then she continued the festivities with the likes of Ashley Benson, Francia Raisa and Sammy Droke. And that was all before the weekend…

On Saturday night, the singer brought out all the glam with a gypsy-themed bash at Malibu's Revolve Beach House. Let's take a look at the guest list, shall we? Nina Dobrev, Jaden Smith, Dylan O'Brien and, you guessed it, Justin Bieber!

According to PEOPLE, "Justin arrived at the party in his leopard-print Audi R8. He was casually dressed and carried a single rose." The report mentions that when the birthday girl saw her on-again/off-again love, she started to cry. Then they "went into the house to talk and were inside for a long time before sneaking out together."

For more from Selena's big day, check out the gallery below! Wasn't it, like, the ultimate celebration?! Chat about it in the comments below, or on our Selena Gomez message board!