But Leigh was of course in character to launch Keith Lemon: The Film, and he had Fern in stitches on the red carpet.
Kellly Brook, who is Keith's love interest in the film, put in a glamourous appearance in a silver dress that showcased her curves.
The comedy tells the rags to riches story of Keith Lemon, a failed businessman who finds fame and fortune after he invents a phone with a light up lemon on the back.
She announced earlier this month she is expecting her first baby with Ronnie Wood's son Jesse.
Several of Leigh's other celebrity pals – many of whom have cameos in the film – turned up to the London presentation.
David Hasselhoff was there with his girlfriend Hayley Roberts, as were Irish stars Jedward and Ronan Keating.