Jennifer Lopez. (AP File)

Jennifer Lopez has confirmed she is ready to have more kids with husband Marc Anthony - but is willing to leave it to chance.

The singer/actress gave birth to the couple's first children - twins Max and Emme, now 17 months - in February 2008 and subsequently stated she wanted to get back work properly before thinking about expanding their family again.

Lopez - who turns 40 on Friday - admits she now really wants to have more babies, but doesn't know whether it will happen for her.

She tells U.S. news show Extra, "I would love to have more kids. I don't know if we will. I don't know if that's in the cards for us. But we'll see."

Lopez also reveals her twins are growing up fast - and have just started talking.

She adds, "They're more than walking now... they're starting to talk. I put Max to bed yesterday... and I said, 'I love you baby. I'll see you tomorrow.' And he was like, 'I love you.'"