After a week of birthday celebrations, Selena Gomez had a blowout bash Saturday night.

And, of course, her ex Justin Bieber showed up to honor the birthday girl with a single red rose in hand.

Since Gomez recently said her and Bieber are not together at this time, it came as a surprise to many he showed up at the party.

"Justin arrived at the party in his leopard-print Audi R8," a source told People magazine. "He was casually dressed and carried a single rose." 

Another source added that the minute Gomez saw Bieber at her gypsy-themed star-studded party, she "started to cry."

"Justin and Selena went into the house to talk and were inside for a long time before sneaking out together."  

A different eye witness told E News the former love birds left the party together at 2 a.m. and spent the night at Bieber's home in Calabasas, Calif.

While Bieber made a romantic gesture by giving Gomez the flower that symbolizes true love, it is unclear if he also gave her the $1 million custom diamond ring he was rumored to have purchased a few months ago.

According to the Hollywood Life, Bieber was going “through final designs” for the ring with famed designer Neil Lane back in May.

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