The former X Factor contestant started a bizarre, impromptu strip tease while in the compound's smoking area, slipping his #TeamRylan onesie off one shoulder and posing in a mirror.
He proceeded to strut around half naked, cigarette still hanging from his mouth, and drop his clothing to his ankles in front of the garden doors.
His nude display prompted a horrified reaction from Neil Ruddock and Ryan Maloney, who had been taking a peaceful swim in the pool.
Clark's stripping was also presumably witnessed by Heidi and Spencer Pratt, who are currently spying on the housemates from the renovated basement as part of a secret task.
The husband and wife team were challenged to stage a walk-out in the wake of Paula Hamilton's eviction last night (January 9).
Maloney and Sam Robertson were then chosen for the second public vote of the series after face-to-face nominations.