Kristen Stewart
Kristen Stewart is allegedly getting serious about her romance with Alicia Cargile.Reuters

American actress Kristen Stewart and best friend Alicia Cargile are allegedly getting serious about their relationship.

Rumours that the 24-year-old Twilight star and Cargile, a Los Angeles-based visual effects producer, are more than friends started circulating after images of them holidaying in Honolulu, Hawaii emerged.

"They are inseparable and mimic each other's everything," a friend close to Stewart told Radar Online.

"When Kristen and Alicia were in Hawaii for New Years, I am sure that they thought no one was going to see them," the insider said. But they are not exactly nonchalant about their relationship anymore.

"Kristen is happy and she is just being herself. She doesn't need to worry about where her next role is going to come from nowadays because she has proven herself as an actress."

Stewart has clearly moved on from Robert Pattinson, who is dating FKA Twigs.

Pattinson broke up with Stewart after she was caught cheating with married director Rupert Sanders.

Though they patched up their differences and started dating again, the two broke up in May 2013 after Pattinson pulled out of his 27th birthday celebrations, which had been planned by Stewart.

In 2010, during an interview with MTV News, Stewart revealed that she is aware of her lesbian fans and the nickname they have given themselves.

"Yeah, yeah," she said when asked whether she knows about "Krisbians". "I totally can't lie about that. Oh my god yeah. In fact it really pisses one person off... my brother [Cameron]."