Katie Holmes driving  Tom Cruise Scientology Center

Katie Holmes took the driver's seat as she chauffeured hubby Tom Cruise around in her zippy little Mini Cooper in LA Monday.

One of Tinsel Town's hottest power couples looked so happy and in love as they headed off to the Scientology Center in Hollywood. We spotted Katie out and about this weekend sporting a noticeably fuller tummy -- could these frequent trips to the Center have something to do with a potential new addition to the family?

The Don't Be Afraid of the Dark star revealed to Marie Claire last year on having more kids: "Maybe in a couple of years, but right now I want to make sure I’m really there for Suri. I’m the youngest in my family — my closest sister is five years older than me, and the next one is nine years ahead of me, so I was a bit of an only child, and I liked it!”