-90210- star Annalynne and the -Twilight- actor have decided to end their romance and the pair have already spotted Annalynne getting close to another man over Halloween weekend.
A source told LifeandStylemag.com: "AnnaLynne was getting cosy with model-and-actor Aaron O`Connell while at Veuve Clicquot`s Yelloween at LAVO in Las Vegas.
"They were holding hands and flirting all night. They looked cute together."
Meanwhile, Kellan was on the other side of the US partying separately at the Borgata casino and hotel over Halloween weekend.
A source said he "definitely seemed like a bachelor".
The 25-year-old hunk - who plays Emmett Cullen in the -Twilight- series - is also set to be away from Los Angeles based AnnLynne for the next several months as he films -The Twilight Saga: Breaking Dawn-.
The couple have had a turbulent relationship from the start, after they were initially spotted kissing on Valentine`s Day in New York in 2009. The pair denied they were an item for most of the last year, before Annalynn - who has also starred in -Nip/Tuck- - admitted in September they were together.
A source added: "They just weren`t compatible, so they are taking a break. AnnaLynne seemed really happy over the weekend. I`m not sure Kellan was the right person for her."