Jaime Pressly Fights Actress Estella Warren Over Lost Purse

Jaime Pressly has found herself under scrutiny after a heated argument with actress Estella Warren on Friday.

The actresses attended a birthday party at a Hollywood hot spot when a disagreement over a misplaced purse broke out, according to Us Weekly.

Over the course of the evening, Pressly's assistant lost her purse, which contained a cell phone. Using the Find My iPhone app, the assistant discovered that the phone was at Los Angeles' Bootsy Bellows. There, Pressly and Warren engaged in an argument that resulted in police being called.

"Jaime was trying to get [the purse] back," a source close to the situation told Us Weekly. "She wasn't aggressive, but she was forceful."

Making matters more serious, drugs were reportedly discovered inside the purse.

"Jaime and her assistant were volunteering for a drug test," added the insider. "They said the drugs weren't theirs. It was this crazy mess."

The alleged purse theft may have occurred at the start of the evening during a birthday bash for publicist Gary Montoosh.

"Estella was at the party as a guest of the photographer, not of the birthday boy," an insider told RadarOnline. "Jaime used the Find My iPhone app- which is like GPS- and saw that her assistant's phone was at a club in West Hollywood … So she immediately left the party with her friend to find out who had it."

Meanwhile, details about the night's events are few and far between. The West Hollywood Sheriff's Department says that they responded to two calls from the L.A. establishment around 2 a.m. Saturday, about a theft and a stolen vehicle, but offered no other specifics.

Zac Efron and Adam Lambert were also among the partygoers at the Bootsy Bellows, according to Us Weekly.

Pressly, 35, is known for her role on the television series "My Name is Earl." Alternately, Warren is best known for her role on "Planet of the Apes."