Selena Gomez ''froze'' when she met Rachel McAdams at an acting class. The 23-year-old star admits she was left completely starstruck after an unexpected encounter with the 'True Detective' actress. She said: ''Rachel McAdams and I actually walked into the same acting lesson. She's so pretty without make-up! I didn't know what to do. I just froze.'' The brunette beauty looks up to her pal Taylor Swift, 25, and thinks their friendship is ''rare.'' Asked about the last concert she attended, she said: ''Taylor Swift. Obviously I've seen every tour she's done, but this one was insane! It's crazy because we're in such different places in our lives, and we've been so consistent [with our friendship]. I'm just so thankful for her, you know? It's rare to have that.'' The 'Hotel Transylvania 2' star recently splurged on a new Givenchy purse and enjoys being able...