AceShowbiz -

Lindsay Lohan is back on the single saddle again after she was dumped by on-off boyfriend Calum Best. The actress-singer who has just completed her rehab stint and decided to wear an ankle bracelet to monitor her alcohol consumption has been dumped by the fashion model-turned-celebrity because she's "too boring" when she's sober, it has been reported.

Lindsay completed her 45-days stint at Malibu's Promises rehab clinic on July 13th. She checked into the treatment center on May 28th following a DUI arrest the days before. This is the second time that the star underwent a stint in rehab. She had been attending Alcoholics Anonymous for about a year before.

On their fresh break up it is said that Best called Lindsay on Friday July 20th, telling her he was finding her post-rehab existence dull and that he didn't want to give up partying. "Calum loves Lindsay, but he's simply not in the same place as her anymore," British newspaper the Daily Star quoted a source as saying.

Notwithstanding with the split, Best originally claimed that he would be joining Lindsay on the wagon and ditching his party lifestyle because he was desperate to stay with her. Now that he dumped her, it is obvious that Best isn't the kind of man who lives his words.