Kourtney Kardashian has moved her family into a hotel after finding dangerous mould in her new house.

The pregnant reality TV star, who already has son Mason, four, and daughter Penelope, two, with boyfriend Scott Disick, checked into the Montage hotel in Beverly Hills last night (18.08.14) after her interior decorator reportedly informed her that her $8.5 million mansion in Calabasas, California is infested with mould.

A source told gossip website TMZ.com that Kourtney, who purchased the property from NFL star Keyshawn Johnson, is ready to sue anyone who's responsible, as she believes the problem was deliberately covered-up with a coat of paint.

The decorator only discovered the mould when he was installing some new fixtures in the house.

The famous family, who recently returned from a two-month stint in the Hamptons, where the 35-year-old was filming her upcoming E! series, 'Kourtney & Khloé Take The Hamptons,' decided it was too dangerous to move back into the house because Kourtney is five months pregnant with her third child.

The brunette beauty and Scott, 31, purchased the sprawling six-bedroom, nine-bathroom mansion earlier this year.

The house was originally put on the market in December 2012 for $10.5 million, but Johnson dropped the price twice after having issues with his former neighbour Justin Bieber, who later sold his house in the exclusive gated community to Kourtney's younger sister Khloé Kardashian, 30.