Bruce Jenner's son is expecting a baby.

Brandon and Leah Jenner (c) Instagram

Brandon and Leah Jenner (c) Instagram

Brandon Jenner, 33, and his wife Leah - who have made a few appearances on 'Keeping Up With the Kardashians' over the past seven years - have announced they're expecting their first child.

The blonde beauty, 32, shared a photograph on her Instagram account today (15.03.15) of her holding her blossoming bump while Brandon plants a kiss on her cheek.

She captioned the picture: "Well, it's time we share the good news. We're having a baby (sic)."

The couple tied the knot in May 2012 in a Hawaiian ceremony and perform in their own pop group Brandon & Leah with one another.

Brandon - the half-brother of Kendall, 18, and Kylie Jenner, 17 - is the Olympic gold medallist's third child.

Meanwhile, it seems the soon-to-be new parents will have lots of support from Brandon's step-sisters Kim Kardashian West, 34, and Kourtney Kardashian, 35, who have four children between them.

However, having another little one joining the family, may make Kim - who already has 21-month-old daughter North with her husband Kanye West - even more determined to fall pregnant.

The blonde beauty has made it no secret that she's desperate to add more children to her brood and recently admitted she and the 37-year-old rapper have been having sex "500 times a day."

Kourtney, on the other hand, gave birth to her third child Reign in December but is reportedly planning to have five or six kids with her long-term partner Scott Disick, with whom she also has Mason, five, and Penelope, two.