Chrissy Teigen doesn't fit into her clothes anymore.

Chrissy Teigen (c) Instagram

Chrissy Teigen (c) Instagram

The 29-year-old model, who announced earlier this month she's pregnant with her first child, can't do the zip up the on her trousers anymore due to her blossoming baby bump.

Taking to her Instagram account, the blonde beauty uploaded a shot of herself in a pair of skin-tight orange suede pants with the zip exploding at the seams.

She captioned it: "Tailors are a miraculous thing. The hem of my pants became my crotch patch. #crotchpatch #belly."

Meanwhile, the stunning star has been bombarded with comments claiming she might be expecting twins due to the size of her belly, but she has since shot down the rumours admitting she knows she's just carrying one baby because she has an ultrasound done "every couple of days."

She fumed last week: "It isn't twins. I can see the damn thing. Get out of my uterus! Please stop. I put one embryo in. I have ultrasounds every few days."

Chrissy and her husband John Legend, whom she married in 2013, announced they were expecting a baby two weeks ago and she's admitted she's looking forward to "all the belly touching" she has to come over the next few months.

She said: "John and I are so happy to announce that we are pregnant. As many of you know, we've been trying to have a baby for a while now. It hasn't been easy, but we kept trying because we can't wait to bring our first child into the world and grow our family. We're so excited that it's finally happening. Thank you for all your love and well wishes."

The happy news comes just a few weeks after Chrissy was reduced to tears when she opened up about her struggles to get pregnant on her new talk show 'The FABLife'.