Certain alleged "former friends" of Britney Spears are claiming the downward-spiraling ex-pop-darling was launched on her current descending career and life trajectory by an early 2007 pregnancy that ended with the loss of the child.
Spears, according to these sources, discovered the pregnancy in January. She believed Kevin Federline to be the father, but when she tried convincing him of this he spurned her. The source told the National Enquirer:
Kevin knew Britney was with other men and at the same time having sex with him to try to win him back. He told Britney that he couldn't forgive her.
This sent Britney into an emotional tailspin, which was made worse when she lost the baby. It was at this point that her family stepped in, forcing her into Promises rehab, which as we know didn't really help much.
It is not known for certain who was responsible for getting Britney pregnant, but skeezy Mario Lopez, who apparently had a relationship with Britney around the right time, has taken the step of officially ruling himself out. Which only leaves a few thousand more men to eliminate as possible suspects.
(source)