Oh no they didn't!

JLO apparently got mad-o because some of the guests to her birthday bash were late!

The chart topping and block buster vixen was initially elated when hubby Marc Anthony surprised the star with a birthday blow out.

But, what would a party be without some drama?  She was reportedly "Fuming" after she noticed several guests had failed to arrive in time for her grand entrance to the song "whatever lola wants"

A source says "Jennifer's party was very intimate, and there was a noticeable amount of empty seats when dinner started.  She was fuming because people were late, and complained really loudly to Marc." 

Oh, no what a tragedy!