Lauren Conrad and Whitney Port Hit the Set

It was a working Thursday for Lauren Conrad and Whitney Port, who were spotted arriving to the set of "The Hills" in West Hollywood earlier today (March 20).

The two young reality stars are currently gearing up for the season premiere of their hit MTV show - which makes its debut on March 24th.

Meanwhile, co-star Audrina Patridge was nowhere to be seen, making some wonder whether there's a rift between the roommates.

Telling that Audrina has become friends with her Hills rival Heidi Montag, LC recently told press: “At this point, I have to question every person that wants to have a relationship with me, whether it’s a friendship or a romantic relationship. (Even) Audrina (Patridge) has to remind me that she’s not someone who’s going to betray me.”

Gossip Girls

Enjoy the pictures of LC and Whitney out to film "The Hills" (March 20).