Britney Spears gave birth to a bouncing baby boy named Sean Preston just over a month ago and already reports say that the pop tart is suffering from the baby blues.

"Britney is down in the dumps and cries at the drop of a hat." And, says a source, she's sleeping late, sometimes until 2 p.m., and avoiding visitors. Adds the Spears insider: "She must feel totally overwhelmed. All of a sudden, she has this baby who relies on her for every single need."

Just weeks after bringing baby boy Sean Preston home from the hospital, Brit has turned bitchy/witchy - raging like a tyrant and driving two in-home nurses to quit on her!

Insiders say the Bayou Bimbette, who attributes her outbursts to hormones, screamed for a nurse every time tiny Sean whimpered -but that wasn't the worst: whenever the tyke was asleep, they say Britney ordered the medical pros to perform such menial tasks as cleaning the johns and the kitchen!

Fed up, the nurses finally told Britney they are not maids - and walked out!

Brit wants her butt back :

"She is dying to be skinny again," a Brit source told Us Weekly.

Brit reportedly was determined to have no more "fat" pictures taken but stepped out in Malibu over the weekend. And hey--she looks good.

America's newest celeb MILF is using light workouts of swimming and walking until cleared to get into a full blown workout program with a personal trainer.

The main goal, reclaim those killer abs and, according to the source, "to get her old killer butt back."