Kristin Cavallari heads to 'The Hills'

Debuts on show May 31

NEW YORK -- Lauren Conrad's "Laguna Beach" nemesis is heading for "The Hills."

Now that Conrad has left the hit MTV reality series, Kristin Cavallari is taking her place.

MTV publicist Emily Yeomans confirms Cavallari will replace Conrad on the show. The season-five finale on May 31 marks Cavallari's "Hills" debut.

The 22-year-old aspiring actress caught the bouquet at the April 25 wedding of the series' duo, Heidi Montag and Spencer Pratt. The event was filmed by MTV.

Cavallari became a celebrity in 2004 when MTV tracked her high school love life and rivalry with Conrad on the reality show "Laguna Beach."