Jenner and Cavallari on Aug. 3
star Kristin Cavallari, 19, and her boyfriend, Brody Jenner
, 22, have split, PEOPLE has confirmed.
"Yes, Brody and I broke up," Cavallari tells PEOPLE. "It's just hard right now because I am working all the time. We're still good friends though."
The off-and-on couple, who met through Laguna Beach
costar Talan Torriero, originally broke up in the fall, but got back together shortly afterward.
In between spending time with Jenner (the son of Olympian Bruce Jenner), Cavallari was spotted several times with Nick Lachey, but friends told PEOPLE at the time that the relationship was "not anything serious."
In March, Cavallari described her romance with Jenner, a Guess model who starred in The Princes of Malibu,
as her "first mature relationship."
"He's good-looking and he makes me laugh for hours," she told Teen People.
Cavallari, who shot to fame on Laguna Beach: The Real Orange County,
recently wrapped her film Fingerprints
and is now shooting Spring Breakdown.
Both are slated for release next year.