Leah Jenner "can't wait" to become a mum.

Brandon and Leah Jenner (c) Instagram

Brandon and Leah Jenner (c) Instagram

The blonde beauty, 32, who is married to Bruce Jenner's son Brandon, 33, took to her Instagram account to express her excitement over welcoming the couple's first child while celebrating Mother's Day yesterday (10.05.15).

Leah - who announced she was pregnant in March - captioned a stunning photo of herself cradling her blossoming bump in a blue wrap dress: "I can't wait to meet this little person. Already feel like a mama."

Brandon also took to the picture sharing site to celebrate the day where he posted a cute photograph of himself and Leah along with his own mother Linda Thompson and his brother Brody.

He wrote alongside the image: "Three generations. Well, one in the belly. Happy Mother's Day!"

Leah has been documenting her pregnancy on Instagram since revealing she was expecting in a post which showed Brandon holding her belly and read: "Well, it's time we share the good news. We're having a baby."

On another photo of her caressing her bump last month, she wrote: "Feeling grateful for this life.(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.

As well as Brody, 31, Brandon also has half sisters Kendall, 19, and Kylie Jenner, 17, and step-sisters Kim Kardashian West, 34, Kourtney Kardashian, 36, and Khloe Kardashian, 30.