The last time J.Lo had a #1 single was in 2005. Her career has been on the backburner for a couple of years now, putting her husband and her twins in the forefront. But her latest single, "What Love Is," is actually better than what she's been shelling out lately. It's a tear-jerker with a danceable beat for those slow-jamming summer nights. It's about hoping to fall in love and believing it just might never happen. It...won't cheer you up, but maybe you can relate.