London, Feb 9 : Legendary singer Cher has admitted that acting with much younger stars in her latest film 'Burlesque' was 'rough'.

The 63-year-old said that felt very insecure after working with singer Christina Aguilera, 29, actress Kristen Bell, 29, and dancer-singerJulianne Hough, 21.

"It's a hard job. You get up at 5am and try to look good. All these girls are a third my age. That is rough," the Daily Express quoted her as saying.

However, the veteran entertainer is full of praise for her young co-star Christina.

"I'm shocked but she's really good. The other day we were hamming it up so badly, so old, like vaudevillian. She was
­keeping up! She was hot. Her game is good," she said.