J.Lo and Marc -- Giant Lawsuit Over Baby Stroller

Jennifer Lopez and Marc Anthony are suing the pants off a stroller company after the singers suddenly wound up in a baby carriage advertisement without being asked first.

It's all over a picture of J.Lo and Marc pushing their twins in a Silver Cross stroller -- the company allegedly took the photo and used it in an ad without asking permission.

In the suit, filed yesterday in L.A. federal court, the power couple is demanding $5 million for their trouble citing their "substantial commercial value."

The duo is also seeking a permanent injunction against any further use of their names or images in the company's advertising and any money they made from the ad.