Actress Selma Blair has dismissed speculation she's reunited and engaged to her ex-boyfriend Jason Bleick after she was photographed with a diamond on her ring finger.

The Cruel Intentions star split from the fashion designer in September (12) after two years together, but she has maintained a close relationship with her ex for the sake of their son Arthur, 23 months.

Blair sparked rumours the former couple had rekindled their romance on Tuesday (25Jun13) when she was snapped smiling as she stepped out in Studio City, California, sporting a big sparkler on her left hand, but the actress has been quick to shoot down the claims.

Taking to her page on Wednesday (26Jun13), she writes, "No engagement. Just a ring."