E! | 9:00 pm
WWE superstars Nikki and Brie Bella return for Season 6 of their unscripted series, which follows the sisters as they prepare for some milestones in their life, including the expansion of their families as they welcome baby boys. They also release their joint memoir, "Incomparable," wherein Nikki opens up about a dark secret she kept from her family for more than 20 years. Elsewhere, the family is shaken to discover matriarch Kathy requires emergency brain surgery, and Brie tries to reunite Nikki with their estranged brother, JJ.