Justin Bieber partied at Catch nightclub in New York City with a mystery girl on Tuesday, EntertainmentWise reports, leaving fans wondering if there's trouble brewing in his relationship with Selena Gomez.

"The 19 year-old, who had the night before hit Catch nightclub in the Big Apple, arrived at 1 Oak nightclub at around 4.30am where he joined rapper French Montana at his table as the stars basked in the attention of their fans," EntertainmentWise writes.

"Witnesses claim the Boyfriend hit maker was surrounded by a bevy of babes for the evening, but stuck particularly close to a brunette."

No reports yet on who the mystery girl is.

Rumors of Selena Gomez and Justin Bieber getting back together intensified after the couple was spotted kissing at her 21st birthday and speculation also suggests the "Heartbreaker" singer will be her date at the Young Hollywood Awards, where she will be honored for her new album.

Fans will find out on Thursday if Selena Gomez will bring Justin Bieber as her date.