Justin Bieber outside Selena Gomez's birthday party. (Fame Flynet)
The "Heartbreaker" singer, 19, arrived at the gypsy-themed house party around 9 p.m., an eyewitness tells Us, dressed down in a black-and-green letterman jacket, dark jeans and white high-tops, with a small present for the birthday girl.
"Justin flew in specifically for the party on a day off from his tour," the source tells Us. "He wasn't dressed in costume, but carried a single red rose in his hand."
The Hollywood pals took shots of chilled VeeV when Gomez's birthday song came on, and noshed on Mediterranean food at the fun-filled bash.
"Everybody danced and had a blast, especially Selena, who was surrounded by her friends," an insider tells Us. Gomez's birthday cake was shaped like an elephant on a pillow, with a giant "21" sitting atop the creation, the source tells Us.
Selena Gomez has been enjoying her 21st birthday celebration. (WireImage)
Gomez even had belly dancers, mermaids, snakes and henna tattoo artists at her themed soiree.
Later in the night, Smith helped the Gomez and Bieber sneak out of the house under a blanket and an umbrella, the source tells Us. Gomez and Bieber were holding hands.
Earlier this month, the "Come & Get It" singer cut an interview short after Chicago's WGN Entertainment host Dean Richards brought Bieber up in conversation.
"Is there something about him that we don't get or we don't understand?" Richards asked about Gomez's reported ex. "I mean, there's one story after the other of pretty outrageous things that we are reading about. What don't we get about him? Or what is it that he's not getting out there?"
Gomez let the awkward silence settle in as she rolled her eyes and glanced off-camera for support from her team. She laughed awkwardly before the interview cut to a black screen urging fans to buy tickets for her Stars Dance tour.
This article originally appeared on Usmagazine.com: Justin Bieber Attends Selena Gomez's Birthday Party, Brings Singer Single Red Rose
Selena is known for being a good girl, but she's had her share of bad-girl moments.
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