Britney Spears’ first husband, Jason Alexander, began his 10-day jail sentence Thursday.
Spears ex-hubby of 55 hours was sentenced to jail after he failed to complete a court-ordered alcohol rehab program following his 2006 DUI arrest, as first reported by Star magazine.
The former couple married and divorced in 2004.
Spears had a better week than her ex this week. The pop star celebrated her 27th birthday on Tuesday and released her much-anticipated comeback album, Circus.


