Britney Spears spent last night celebrating her birthday with her cousin Ali Sims and Paris Hilton. Britney Spears actually turned 26 years old today December 2nd. Britney still denied last week that she was pregnant! But reports still coming out from close friends say she is pregnant. According to the News of the World, pop star Britney Spears, 26, is pregnant with her third child. I guess we'll have to wait and see.