Washington, Apr 15 : American actress Maggie Gyllenhaal has joined the cast of ‘Nanny McPhee and the Big Bang’, a sequel to Working Title''s 2005 hit ‘Nanny McPhee’.

Gyllenhaal, 31, will be starring alongside Rhys Ifans, Maggie Smith and Asa Butterfield.

Ralph Fiennes is said to be in talks for an uncredited cameo, reports Variety magazine.

Brit actress Emma Thompson will be penning the script, exec producing, and reprising her role as a magic-wielding governess.