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Perhaps absence makes the heart grow fonder?

Although Kris Jenner has said that there's "no place" for Scott Disick "in our family," she is starting to change her tune now that he's relocated to Miami to be with Kourtney Kardashian and their three-month-old baby Mason.

"I think he is trying to be a good dad, trying to be a good boyfriend," Jenner told at Chelsea Handler's Chelsea Chelsea Bang Bang book launch party in Beverly Hills Wednesday. "Trying to step it up and be responsible."

Why the change of heart?

"It's a lot to handle when you have a brand-new baby, no matter what your situation is," Jenner says. "I admire him for being a great dad and for working hard at his relationship with Kourtney."

Indeed, Kourtney tells the new issue of Us Weekly that she's "tired of all the lies" about relationship problems being reported by tabloids.

"Mason brought me and Scott closer together," she says. "Our relationship is stronger."

Jenner also tells Us Kourtney is "almost ready" to start the Kardashian-launched Quick Trim diet and lose her pregnancy pounds. "She's still nursing, but it's great because I have to get my last snickety snacks in before I start!"

For more details about Scott's babysitting skills, Kourtney's post-baby body and how the couple handle the tabloid drama, pick up the newest issue of Us Weekly, on stands today!