Chantelle Houghton and her ex-husband Preston have reunited in 'Ultimate Big Brother' tonight (24.08.10).

The former couple - who met on the celebrity version of the show in 2006, married later that year and then divorced in 2007 - have met up in the Channel 4 compound, where they will live together for the next two weeks until the grand finale on September 10.

The former husband-and-wife were the first two celebrities to enter the house, following Josie Gibson's mammouth win on 'Big Brother 11' earlier in the evening.

After Preston - real name Samuel Preston - entered, Chantelle repeated: "Oh my God. Oh my God. F**king hell, I'm a bag of nerves!"

While the former Ordinary Boys singer joked: "Do you come here often?"

The trio were shortly joined by transsexual Nadia Almada - who has taken over 200 cigarettes in with her in a bid to keep her calm - and 'Big Brother 2' winner Brian Dowling.

Before re-entering the house, Brian asked host Davina Mccall: "Why am I doing this?"

Josie jumped on him as soon as he stepped through the door, saying: "I love you Brian.

The group were quickly joined by Ulrika Jonsson, who won 'Celebrity Big Brother' back in 2009, busty 'Big Brother 2005' housemate Makosi Musambasi and horse racing commentator John Mccririck.

John - who was holding a sign reading "Evict Me Please" - told brunette Davina he wanted to leave as soon as possible, and was only in the competition for the money.

He said: "That's the only reason I'm doing it."

Rapper Coolio was the next celebrity to enter the compound, rapping to the crowd on his way into the house whilst wearing diamonte-encrusted sunglasses.

The song went: "Who's ready for the Ultimate? I'm going to be the Ultimate... housemate!"

Nikki Grahame, from 'Big Brother 6', was the next to walk into the house, admitting she hoped Chantelle wasn't inside.

'Nasty Nick' Bateman -who was famously kicked out of the first series for cheating - was the final entrant, and promised the crowd he would be sticking to the rules this time.

Two new mystery stars are set to enter the house on Friday (27.08.10), but not through the front door.