Prince William and wife Kate's just-announced pregnancy is already shaking up the celebutot hierarchy in Hollywood. It's enough to make some A-list babies born this year you-know-what in their diapers. A look at the new top five.

By Jessica Shaw
Updated December 07, 2012 at 05:00 AM EST

1. The Royal Bump
The mere thought that Queen Elizabeth might change a nappy sometime in 2013 puts this heir-in-the-making on top of the list.

2. Blue Ivy Carter
Beyoncé and Jay-Z‘s daughter is music royalty. Let’s not forget that sounds of her crying hit the Billboard charts the week after she was born.

3. Samuel Affleck and Tennessee Toth
It’s a tie! Each one’s got an Oscar-winning parent — Ben Affleck and Reese Witherspoon, respectively — and two adorable older sibs. No pressure, guys.

4. Olive Barrymore Kopelman
Talk about lineage. One grandfather was the CEO of Chanel, and another was John Barrymore. Dad is Robert Pattinson‘s art dealer. And mom Drew Barrymore isn’t so shabby herself.

5. Maxwell Johnson
Jessica Simpson‘s daughter’s spot might have gone to Adele‘s son, but we don’t even know his name. So, uh, congrats!