TOM CRUISE and KATIE HOLMES are already working on baby No. 2!

Less than two months after the birth of baby No. 1, TOM CRUISE and KATIE HOLMES are already working on baby No. 2!

The 43-year-old "Mission: Impossible" star and his bride-to-be became parents of daughter Suri on April 18, but Katie can't wait to have another one, insiders say tell NationalEnquirer. In fact, they say she may already be pregnant!

"Tom and Katie are so thrilled with Suri that they want to have a second baby right away," said a source close to the couple. "And they're hoping to announce the news as early as their planned July 4th weekend wedding.

"Before Suri's birth they talked about having two or three kids — and they don't want to wait."

In fact, 27-year-old Katie never dreamed she'd take to motherhood so well.

"Katie was really scared of becoming a mom," an insider divulged. "She didn't know what to expect and she was worried that she'd be overwhelmed by all the responsibilities. But she's loving every minute of being home with Suri. Katie isn't at all concerned with getting back to work."

Meanwhile, Tom Cruise was recently named the world's No. 1 star, according to Forbes' annual “Celebrity 100 Power List,� which ranks famous people based on earnings and buzz.

The ranking tracks the highest-paid stars from the worlds of television, film, music and sports, said editor Lea Goldman.

“It's what kind of currency does the star's name have,� she said. “It's increasingly important how they are perceived both in industry circles and commercial circles, and this list represents who has cachet in both arenas.�

In other news, Tom Cruise is hoping to impress his Japanese audience by chartering an entire 1,300-seater high speed "bullet" train to take 150 fans on a trip from Tokyo to Osaka on Wednesday.

The two-and-a-half hour train ride is part of the publicity campaign for his latest film "Mission: Impossible III", which premieres in Japan next week reports Reuters.