The Mean Girls star and her pal, the daughter of Yahoo! CEO Terry Semel, have become inseparable recently and last week attended a housewarming party at the Los Angeles home of "Power Lesbian" Jeanette Longoria together.
A fellow partygoer told the New York Post newspaper: "Lindsay came with Courtenay to the party around midnight and they stayed for an hour.
"The girls held hands and were with each other the whole time. Every time I see Lindsay, there's Courtenay. They are always together."
While at the party, Lindsay, 21, and Courtenay, 28, referred to themselves as "roommates" and told guests they had been living together in Los Angeles for about a month. They left the party together and were seen shopping in Beverly Hills the next day.
A representative for Lindsay: "The two are good friends, nothing more."
Lindsay - who split from snowboarder Riley Giles, who she met in rehab this summer - has previously been linked to her DJ friend Samantha Ronson, the sister of producer Mark Ronson.
The troubled actress - who was treated at Utah's Cirque Lodge for drug and alcohol addiction after being charged with DUI (driving under the influence) - was said to be nervous at Jeanette Longoria's party, where other guests included Diana Ross' son Evan Ross and Brandon Davis.
The party insider said: "Lindsay seemed really nervous. It was the first time she's seen a lot of people from her past life and she seemed socially awkward - like she was sticking by Courtenay for support."
Semel infuriated her billionaire father by agreeing to star in E! reality show Filthy Rich: Cattle Drive alongside Fabian Basabe, Brittny Gastineau and Katy Benetar. The show, produced by Joe Simpson, featured a group of spoiled, rich kids trying to rough it on a Colorado ranch.
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