Brit's Too 'Toxic' for Justin

TMZ reports that Britney has been a busy bee doing a few things lately. Number one is hitting the recording studio, which is a good thing. Two is hitting the Mickey D's drive-through, which is a not-so-good thing. Three is hitting the phone lines trying to reach Justin Timberlake. What??

Sources tell TMZ that Britney has been trying to phone former flame JT, but he's not taking her calls -- and, as TMZ recently reported, JT isn't keen on any love rematch. We're also told that when JT's ex, Cameron Diaz, got wind of the calls, she didn't like it one bit -- and has tried to get through to Britney's people to ask her to stop calling her old boy.