LOS ANGELES, CA - SEPTEMBER 06: Wiz Khalifa and Amber Rose arrive at the 2012 MTV Video Music Awards at Staples Center on Sep
Kevin Mazur

Despite weed making up about 70% of Wiz Khalifa's public persona—he openly admits to smoking marijuana, named his debut album Rolling Papers and made a stoner flick with Snoop Dogg—there's one thing that will keep the "Young, Wild & Free" MC restrained: His pregnant fiancée Amber Rose.

"He would never, ever smoke in front of me," Rose told XXL, explaining that Khalifa has refrained from lighting up while she's with child. "I’m still sick now in my second trimester... The smell sensitivity is still very strong. Certain things, as soon as I smell them, I throw up immediately." One of those things—sadly for the Taylor gang—is sticky-icky.

"Even just living in California is really hard because there’s weed shops everywhere," Rose continued. "So even when I’m driving and I go down the wrong block, I get sick." I'm guessing Wiz is more of a "windows open" than "air-conditioning" guy when he's home.

Clearly, these two are going the extra mile to ensure the baby's health: Rose is even forgoing medicine for an all-natural water birth. “I want those bragging rights!" Rose reasoned. "The next time Wiz has a stomach ache or anything, I’ll say, ‘I popped out a baby all-natural.'" And there's really nothing you can say that trumps that. 

Khalifa & Rose also told XXL they're going the progressive route and waiting until after she's given birth to have the wedding ceremony. "We’ll probably get licensed and married before the baby’s born and do a wedding afterwards," Khalifa said. "It makes more sense for the baby to be in the wedding than for her to be pregnant."

Rose pointed out there's a practical reason for waiting, too. "Being pregnant, I’m tired a lot. So to have a whole wedding and planning it all out and the reception…. I just don’t want to be sleeping when everybody’s partying at our wedding."

It's just like her fiancé says: "The bigger the bill, the harder we ball." And I'm guessing they're dropping some serious dough on this wedding.