Miley Cyrus rang in 2015 by partying in Las Vegas with her boyfriend Patrick Schwarzenegger, his famous father Arnold and Britney Spears. Cyrus began dating “The Terminator” star’s son in October, and their romance sparked rumors that his mother Maria Shriver was worried about any influence the singer might have on her son. However, Cyrus showed she is growing close to the family by heading to Sin City on New Year’s Eve with her boyfriend, his father and his father’s new girlfriend Heather Milligan. According to New York Post gossip column Page Six, they were joined by actress Sofía Vergara and her rumored fiance Joe Manganiello for dinner at a steakhouse, before heading to watch Spears’ show at the Planet Hollywood resort.