Jaime Pressly Fight

An insider said Pressly, 35, simply wanted to get her assistant's phone back and that the confrontation could hardly be called a fight. Another source said Pressly and her assistant discovered that the phone had gone missing at the original party location, though used the "find my phone" application to track it down. Strangely, it tracked it to hotspot Bootsy Bellows, where Warren and several other guests including Zac Efron and Adam Lambert were continuing the celebrations. According to the source, Warren claimed the phone was hers once Pressly had arrived and confronted her.

At one point, drugs were allegedly discovered in Warren's purse, which led to the police getting involved. "Jaime and her assistant were volunteering for a drug test. They said the drugs weren't theirs.It was this crazy mess," added the source.

An investigation into the whole furore is currently underway and West Hollywood police confirm they were called out to the Bootsy Bellows nightclub late on Friday evening.
Source: Jamie Pressly Fight With Estella Warren Was Over Stolen Cell Phone by Contactmusic.com
Both actresses have had run-ins with the law in the past.

Warren was arrested in May 2011 after she hit three parked cars in Los Angeles and then fled the scene. After cops tracked her down, the "Planet of the Apes" actress was arrested for DUI. When cops attempted to apprehend her, she assaulted one of the officers and was re-arrested for felony battery on an officer, according to the Associated Press.

Earlier that same year, Pressly was arrested on suspicion of DUI in Santa Monica, Calif., People previously reported. She eventually pleaded no contest.
Source: Jaime Pressly, Estella Warren Fight At Hollywood Club, Cops Called (REPORT) by The Huffington Post
When police arrived, she reportedly kicked an officer while being arrested and even tried to escape from the police station, according to the Los Angeles Police Department.

She entered a no contest plea and was sentenced to four months in residential rehabilitation and five years of informal probation.

As for Jaime, the Emmy award winner was arrested in 2011 on suspicion of driving under the influence in Santa Monica, California and was charged with two misdemeanours.

At the time she was also under the watchful eye of the IRS and the state of Calfornia for reportedly skipping out on as much as $637,000 in unpaid taxes.
Source: 'She took my assistant's purse!' Sheriff's called to Hollywood hotspot after Jaime Pressly accuses Estella Warren of 'stealing handbag and iPhone' By Bianca Carneiro