Chris Brown and his girlfriend Karrueche Tran have sparked rumours that the model is pregnant with their first child.

The couple's friend, Wackstar, posted a photo of the two on Instagram, and claimed they are expecting a baby.

Congratulations I hope is a boy ????

A photo posted by WackStar (@wackstar) on

"Congratulations I hope is a boy," Wackstar captioned the image, with a surprised expression.

This post comes after the Loyal singer told his fans on Instagram that he was ready to have a baby with Tran in August.

"@karrueche damn near 5 years and this woman still putting up with my shit. Need to have this baby and stop playing! Lol! My WCW," he wrote, along with an image of the model.

The Say Goodbye singer reportedly started dating Tran amidst his romance with Rihanna. The two briefly split in October 2012 when Brown admitted he was "in love with two people."

Meanwhile, the 25-year-old R&B star appeared on Hot 97's Ebro In The Morning radio show and expressed his love for Tran.

When asked how long they have been together, he replied: "Almost five years. Four and a half. She's straight I dig her, I dig her man, She's dope.

"I feel like especially being in this industry you need someone that understands you and understands who you are personally except for your name.

"You don't have to be buying them bags, let me stunt on you right quick. Although I do it because I love her, but that don't come with the territory, at the end of the day we have a real connection as best friends on top of our intimacy," he added.