Calvin Harris is reportedly trying to "avoid" Rita Ora. The 30-year-old DJ is worried about bumping into the 23-year-old singer this weekend in Las Vegas and is doing everything he can to stay away from her. A source said: "Calvin has been asking mutual friends to keep him in the loop of her plans so they avoid each other. He's been doing everything he can to avoid bumping into her. " Calvin is in Vegas almost every week and feels like it's his turf. He doesn't want the pressure of worrying about seeing her." The insider explained: "If Calvin bumps into Rita and she's with her new boyfriend, he'll be gutted. He wants to know which parties and events Rita is planning on going to so he can stay well clear. Calvin knows that if they accidentally end up in the same place, it'll be beyond awkward for the both of them." Calvin announced on Twitter in June that he'd ended his year-long relationship with Rita "some time ago", but wished her all the best in the future. Rita then took to her account a week later to claim she had "moved on" from her former lover.