Jason Wahler is behind bars in Washington after he was booked on assault charges on Friday (25Sep09).
Officials at the Yakima County Jail, near Seattle, have confirmed Lauren Conrad's ex-boyfriend is spending time at their facility.
The 22 year old was arrested in Seattle and charged with assault and minor drinking.
A source tells RadarOnline.com, Wahler will serve at least 80 days behind bars.
Last year (08), the reality TV star was ordered into rehab after he punched a tow truck driver in the face and he was jailed in 2007 after fighting in the lobby of a Seattle hotel.