(Cover) - EN Showbiz - Jennifer Lopez has "too much going on for her right now" professionally to judge American Idol.

The superstar singer-and-actress is preparing to release her new romantic comedy What to Expect When You're Expecting this weekend. Jennifer will also begin a concert tour with Enrique Iglesias and Latin group Wisin Y Yandel in July performing at dates across North America.

Jennifer is thought not to return to her post on the TV show due to all of her many career obligations.

"There is just too much going on for her right now," a source told Us Weekly magazine. "She regrets she can't stay on the show. It's been an incredible experience and she is forever grateful that she did it."

Jennifer's tour will take place in 20 cities in the US, Canada and Latin America. The performances will kick off in Montreal, Canada, on July 14.

The superstar recently garnered the coveted top spot on Forbes' 2012 list of most powerful celebrities. (C) Cover Media