Sienna Miller is anxious about belly dancing in Just Like a Woman because she isn’t co-ordinated.

Sienna will portray the female lead in the drama set for release next year, which tells the story of a Chicago housewife who runs away to Las Vegas to enter a belly dancing competition.

The talented actress is looking forward to shooting the movie, although admits she is nervous about mastering complex dance moves.

“Yes, it will be interesting. I’m not the most co-ordinated person but we’ll see,” she told the British edition of OK! magazine.

The stunning actress is famed for her slender figure, and admits the prospect of gaining weight doesn’t fill her with joy. That said, she understands there are variations of the dance genre which don’t require such a large stomach. Sienna fears her movie producers want to give her a traditionally large midriff though.

“There is a certain type of belly dancing where you don’t need a belly, although I read they’re looking forward to putting one on!” she added.