London: Birthdays make her nervous, accepts actress Penelope Cruz. Infact, she gets so jittery while cutting her birthday cake that she is unable to hold on to herself.

The actress has admitted she gets more nervous during her birthday celebrations than at the Oscars and once set her hair on fire while blowing out the candles.

The 37-year-old Spanish beauty, who gave birth to a son in January, said she gets uncomfortable with all the attention on her birthday and words fail her, reported Daily Mail.

"I always get nervous celebrating the birthday. I get nervous when people sing 'Happy Birthday’; I get nervous when I have to open the presents in front of them. I get more nervous than even at the Oscars," she said.

"If I like it or not, I don't know how to express myself. The other day I got so nervous that when I had to blow the candles, my hair caught on fire," Cruz added.