'I look like I'm about to pop, but I'm not!' Kristin Cavallari shows huge bump in tight grey dress... after saying sex is the key to a happy marriage

By Iona Kirby For Dailymail.com

Published: 17:27 EST, 29 September 2015 | Updated: 05:55 EST, 30 September 2015

Kristin Cavallari insists she’s still got some way to go in her third pregnancy.

But the 28-year-old was showing off a huge baby bump on Monday, as she shared a photo to Instagram on Tuesday.

The snapshot showed heavily pregnant Kristin wearing a sleeveless grey sweater dress, which clung to her burgeoning belly.

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Bumping along nicely: Kristin Cavallari showed off her huge baby bump in an Instagram photo with her hair stylist on Monday, while 16-month-old son Jax played in the background

Bumping along nicely: Kristin Cavallari showed off her huge baby bump in an Instagram photo with her hair stylist on Monday, while 16-month-old son Jax played in the background

The Hills star was cuddled up to her hair stylist, who had just given her a full head of highlights.

‘I love you @anderssonjj for coming all the way to Chicago to touch up my hair color #hedidntreallycomejustforme #wethair #ilooklikeimabouttopopbutimnot,’ she wrote alongside the image.

Kristin’s 16-month-old son Jax can also be seen in the frame, while she shared a cute photo of three-year-old Camden the previous day.

Big brother: The Hills star is expecting her third child, a baby girl. She also has three-year-old son Camden

Big brother: The Hills star is expecting her third child, a baby girl. She also has three-year-old son Camden

The reality star turned shoe designer married Chicago Bears quarterback Jay Cutler in June 2013 and they announced in May that they are expecting their third child together - a baby girl.

Kristin recently shared her tips for a successful marriage with a blog post, saying that sex should be a priority. 

'You gotta have sex – men need it, and it’s important for the relationship,' she wrote. 'It doesn’t have to be all the time, but you have to get it in there sometimes!'

Mamma mia: Kristin, pictured at the MADE Fashion Week show earlier this month, has been favouring clingy dresses during her third pregnancy

Mamma mia: Kristin, pictured at the MADE Fashion Week show earlier this month, has been favouring clingy dresses during her third pregnancy

Kristin also said that intimacy outside the bedroom is crucial, adding: 'It’s so important to make time for each other, even if it’s just waiting to eat dinner after the kids go to bed. And even if it’s takeout, light candles and make an effort to connect.'

On top of her various design ventures and motherhood duties, the Laguna Beach: The Real OC alum is gearing up to promote her new book.

Balancing in Heels: My Journey to Health, Happiness, and Making it all Work is available for pre-order now and will be released in May.

'You gotta have sex': The 28-year-old recently shared her secret to a successful marriage with Jay Cutler. The couple, who tied the knot in 2013, are seen here in May

'You gotta have sex': The 28-year-old recently shared her secret to a successful marriage with Jay Cutler. The couple, who tied the knot in 2013, are seen here in May

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