Justin Bieber and Selena Gomez
Selena Gomez was least affected by Justin Bieber celebrating his 21st birthday with Yovanna VenturaREUTERS

Canadian singer and songwriter Justin Bieber celebrated his 21st birthday with Yovanna Ventura and former girlfriend, Selena Gomez was least affected by it.

It was previously reported that the Baby singer is spending time with the 18-year-old Spanish model to upset the former Disney star.

"Selena doesn't really care who Justin hangs out with – and wasn't surprised that Yovanna and Hailey [Baldwin] were at the party," a source told Hollywood Life.

"While she doesn't dislike Yovanna, Selena was well aware that the model held a torch for Justin," the insider added. "Especially after Selena and Justin tried to make a go of their relationship towards the tail-end of last year."

Meanwhile, Ventura posted a series of photos from Bieber's birthday party on her Twitter account.

Gomez has moved on from the Boyfriend singer and is getting serious about her relationship with Russian-German music producer/DJ Zedd.