It's J.Lo's Party and She'll Cry If She Wants To

The actress apparently was not pleased that certain celebs came late to her 40th birthday bash

Jennifer Lopez apparently appreciates punctuality.

The actress turned 40 on Saturday with a fancy dinner fete at the Edison Ballroom.

But according to the N.Y. Daily News, J.Lo was none too pleased that not all the partygoers were on time.

"Jennifer was really irritated," the Daily News reports. "She was fuming because people were late, and complained about it really loudly to Marc," says one partygoer, who added, "Jennifer was visibly upset and embarrassed.

So who was late, and which celebs arrived on time and stayed in Jenny's good graces?

Alicia Keys and her boyfriend Swiss Beats were reportedly late, while Ricky Martin, Liza Minelli and Leah Remini were all right on time.

Missing in action from the birthday bash? Tom Cruise and Katie Holmes.

In the photos from the party, you can tell J.Lo's crying, but we're not sure if they were happy, overwhelmed tears or sad ones.

Eventually, Jennifer got over her annoyance. The birthday girl tossed back champagne and partied til 4 a.m.

Her rep wasn't available for comment.

Do you think she was justified in being mad? Or is she still just being the diva we know and love?