Kelly Rowland Refuses to Bow Down to Beyonce Knowles, Who Celebrated with Jay-z

It was a big week for Beyonce. She celebrated the anniversary of the 40/40 Club with Jay-Z, after being attacked by Kelly Rowland.

Kelly Rowland, former Destiny's Child member, found herself in the hot seat. The star was appearing on Watch What Happens Live, a show created by Andy Cohen. Cohen, who also hosts the program, has a segment entitled "Plead the Fifth," where he asks guests tougher than normal questions.

Rowland was asked to describe Beyonce's most annoying trait. Uh oh.

Kelly was as diplomatic as one could be, but didn't refuse to answer the question. She told Andy:

"She would tell you this. She's a slob. If you walk in (there's a mess)--maybe she's gotten better since becoming a mother--but she's got a lot on her brain. You can tell she's got a lot going on."

Beyonce didn't let this slow her down for a minute. The superstar was spotted later that evening, dancing the night way.

Her and hubby, rap mogul Jay-Z, were celebrating the 10th anniversary of Z's 40/40 Club. A source spoke to Us Weekly about how the pair interacted at the event:

"You see that they are each other's biggest supporters. She was beaming at him throughout the night...That is true love and respect."

At around 2 a.m, the singer belted out a different tune--one in the form of a toast. After ordering top shelf cognac for everyone in attendance, she said to Jay-Z, "You should be proud of this milestone."