DENVER -- Britney Spears "rehab dolls" have begun showing up on online auction sites like eBay.

The dolls featured shaved heads, mimicking the look Spears had when she entered rehab treatment.

One doll even shows the singer with a shaved head wearing a straight jacket. It went for $182.49 when it was auctioned recently. Other Spears dolls aren't fetching so high a price, however.

Spears is undergoing treatment at Promises rehab centre in Malibu, Calif., where she was reportedly visited by her estranged husband Kevin Federline and her two sons over the weekend.