CAN ANYTHING EVER TOP THE LOVE OF A SISTER? THEY ARE THERE TO SEE US THROUGH THE BEST AND WORST OF TIMES. SOMETIMES, THEY KNOW US BETTER THAN WE KNOW OURSELVES. AS WE WATCH MARY MARY'S ERICA AND TINA CAMPBELL WORK THROUGH THEIR CHALLENGES WITH LOVE ON THEIR REALITY SHOW, WE'RE TAKING A LOOK AT 13 CELEB SISTERS WHOSE RELATIONSHIPS INSPIRE US.