Pressly was stopped for a traffic violation around 11 p.m. on Wednesday, according to Lt. Darrell Lowe of the Los Angeles County Sheriff's Department. The violation was not specified, but Lowe says no traffic collision was involved.
Pressly's blood-alcohol level wasn't immediately released.
The Los Angeles County sheriff's website says the 33-year-old actress-model spent the night in jail and was released Thursday morning after posting $15,000 bail.
An e-mail to her manager seeking comment wasn't immediately returned.
The Associated Press contributed to this report