They are joined in the latest series of the Channel 5 show by ex-EastEnders and Footballers Wives actress Gillian Taylforth, model Paula Hamilton and former football star Neil 'Razor' Ruddock.
One absentee is comedian Jim Davidson, who had been due to appear but was dropped after being arrested by detectives over allegations of sexual offences, which he denies.
Clark was installed as favourite to win the show by bookmaker William Hill, with Dett-ori, weeks ago given a six-month ban from his sport, next favourite.
Also taking part are Neighbours star Ryan Maloney, who has played Toadfish since 1995, former Coronation Street actor Sam Robertson and reality TV couple Heidi Montag and Spencer Pratt.
One-time Heartbeat actress Tricia Penrose and glamour model Lacey Banghard complete the line-up.
The series is to last three weeks, with the first eviction of the person least popular with viewers and housemates due on Wednesday.