Britney back in rehab - again

Britney Spears has gone back into rehab for the third time, according to a US report.

The shaven-headed pop princess (picture provided by KABC-TV) has already been to two treatment centres over the last week, checking out after just 24 hours each time.

Now the mother-of-two is back at an unidentified facility for what should be a 35 to 40-day stay, according to showbiz website TMZ.com.

As a result a planned emergency family law court hearing called by Spears' estranged husband Kevin Federline has been cancelled, it reported.

The singer checked out of the Promises Centre in Malibu yesterday morning.