Did Justin Timberlake Dump Jessica Biel A Month Ago?

And was it his flirts with Rihanna or Jessica's clinginess that may have been the last straw?

Justin Timberlake and Jessica Biel are one of Hollywood's favorite couples to speculate about, but this time their breakup sounds on the money.

Apparently a celebrity rag mag is about to confirm the breakup, saying that Justin did the dumping and Jessica is now chasing him. For months sources have suggested that the two seemed a little too low-key to be happy together. Some have said his hectic schedule and single nature and her neediness may have been factors in a fizzle between them, but reportedly for the last month -- yes, a whole month -- witnesses have seen Justin out in L.A. partying incessantly, and solo.

How they kept it down low we'll never know, but click here to read Jessica Biel's beauty secrets, or which television network wants Justin Timberlake back.