US Magazine: Sorry, Suri -- looks like you might not get the chance to be a big sister after all.

In the October issue of Marie Claire, Katie Holmes reveals that she and Tom Cruise have no plans to expand their brood -- at least not now, anyway.

"Maybe in a couple of years, but right now I want to make sure I'm really there for Suri," Holmes, 31, says. "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! I liked having all of my mom's attention, and sometimes I think I still do."

Holmes admits it's been hard to strike a balance between her career and motherhood, though she does her best to provide a normal life for her 4-year-old tot.

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