The 9th Annual UNICEF Snowflake Ball was held in New York City on Tuesday night, and several celebrities put on their best gowns and tuxedos to attend the black tie gala.

Selena Gomez looked stunning in a sleeveless black dress with gold and velvet accents. The singer/actress arrived solo to the event, which honors those who support UNICEF's mission to save children's lives.

Gomez and her boyfriend Justin Bieber's relationship has been in the spotlight recently with rumors suggesting they broke up and then got back together again. Neither have confirmed a split, but they've attended several public appearances by themselves.

Katy Perry also attended the Snowflake Ball, wearing a semi-sheer navy blue gown with a matching shawl. She and her boyfriend John Mayer are reportedly looking for a house together.

Check out more stars from the event, including photos of Uma Thurman, Kelly Ripa and Selita Ebanks...