Andre Agassi and Steffi Graff

They've been tennis' ultimate power couple for over a decade now, and judging by how happy they appear to be with their beautiful family, it looks like they're here to stay. And considering that they've won a total of 30 Grand Slam titles between them, they're one of the most successful sports couples as well. Who knows, their kids also might end up winning a few Grand Slams a few years down the line--after all, they do have two of the most experienced coaches at their disposal!

-Picture courtesy virginmedia.com-