Jessica Alba has revealed she would be up for appearing in Avatar 2.

The US actress would relish the thought of working with filmmaker James Cameron again, after he gave her her big break when he picked her to star in cult TV series Dark Angel.

"He knows where to find me - I'm always available to him," she told GQ.

"If we can work together and have a successful movie and make a lot of money, then great. But most importantly, he's my friend."

Jessica, who next stars in Robert Rodriguez's Machete, added: "Career-wise, the most impactful people for me have been James Cameron and Robert Rodriguez."

The 29-year-old also admitted she felt nervous around Robert De Niro, who she co-stars with in the slasher thriller.

"It felt like I was dreaming. You work with De Niro and you suddenly feel totally different," she said.

"My heart was beating fast, I got tongue-tied, I was sweating and so nervous. But he was so sweet, and gentle, calm, quiet and kept to himself."