Talulah's tight corset makes film wedding a breathless affair

Actress Talulah Riley has admitted being floored by an extremely tight wedding dress during the filming of new romantic comedy The Knot.

Riley, who plays bride-to-be Alexandra, said she has to lie down for relief during breaks in shooting at St Dunstan's church in Stepney Green.

The 25-year-old St Trinian's star said: "When I'm not working, I throw myself down on the ground because I can't actually breathe in my corset. The dress is beautiful but I breathed in at the fitting which was a big mistake."

Riley appears opposite Matthew McNulty, 28, as her fiancé Jeremy, in the film written by a team including Noel Clarke - best known for his gritty dramas Adulthood and Kidulthood. The cast also includes American Pie actress Mena Suvari, 32, as chief bridesmaid. Riley's own wedding, to US entrepreneur Elon Musk in Scotland six months ago, was "hitch free". But she said filming her first on-screen marriage was surprisingly nerve-racking.

"It's quite strange really walking down the aisle, many times over. I was standing in a big white dress with people on both sides and a guy standing at the end and though I don't normally get nervous, it made me feel quite jittery as if I really was getting married."

Clarke, 35, who plays the best man, Peter, said it was fun to set a story about relationships on a wedding day. "There's so much riding on it. It adds to the comedy when everything goes wrong.

There's a big market for romantic comedies and I hope we can deliver something for the modern generation that is really funny."

Filming, which has taken place across east and south London including Sundridge Manor Park in Bromley, finishes today and the movie is scheduled for release on Valentine's Day.