Credit: Jamie McCarthy/Getty Images

Trouble in paradise?

Kim Kardashian revealed that she and on-again beau Reggie Bush have something to fight about: He takes longer to get ready than she does!

"It's, like, our biggest fight," she told George Lopez when the Us Weekly cover girl and sister Khloe Kardashian appeared on Lopez Tonight Tuesday.

"He's just really indecisive on what his mood is, on what he wants to wear," the reality star, 29, said.

Kim may have caused another fight with the 24-year-old NFL star -- whom she reunited with in late September after announcing a "break" in July -- when she mentioned his "really weird habit" on the late night show.

"He loves to vacuum all day -- loves to!" Kim said. "He's going to kill me for saying that."

To read more of our "Growing Up with the Kardashians" cover story -- full of vintage family snapshots, details on their current, sky-high earnings as celebs plus their get-glam tricks -- pick up the new issue of Us Weekly, on newsstands today!