Justin Bieber celebrates 21st birthday by posing shirtless with Hailey Baldwin and Yovanna Ventura

Canadian singer and songwriter Justin Bieber celebrated his 21st birthday with his model friends Hailey Baldwin and Yovanna Ventura.

The 18-year-old Spanish fitness model, who was rumoured to be dating the Baby singer, posted a photo of herself on Instagram, with her leg wrapped around him, along with the message: "Happy Birthday!"

Meanwhile, American actor Alec Baldwin's niece, who was also romantically linked to Bieber, shared a picture on Instagram of herself, with her arms wrapped around him.

Meanwhile, Bieber's former girlfriend, Selena Gomez was not invited for his birthday party.

"Selena pretty much knew that she was never going to get an invite to Justin's 21st birthday party," a source told Hollywood Life.

"But she wasn't downhearted by it – she's moved on with Zedd an older boyfriend, and is enjoying the most grown-up relationship she's ever been in," the insider added. "There is no drama – like with Justin – and it's all very easy."

"Selena doesn't really care who Justin hangs out with – and wasn't surprised that Yovanna and Hailey were at the party," the source went on.