Ariana Grande Celebrates Her 25th Birthday

Plus, check out videos from her birthday party.

Ariana Grande is celebrating her 25th birthday in a big way. A party was thrown in her honor last night. Plus, her fiancé (Pete Davidson) has taken to Instagram to express his love for Ari.

The Saturday Night Live star shared a photo on social media with a sweet caption. The photo, which appears to have been taken backstage at the Billboard Music Awards, shows Ariana on Pete's back. 

Happy Birthday, Ari!