Pop star Selena Gomez 'froze' when she ran into 'True Detective' star Rachel McAdams at an acting class. READ: Selena Gomez rooting for Justin Bieber The 23-year-old 'Heart Wants What It Wants' hitmaker said she was left completely starstruck after an unexpected encounter with McAdams, 36, reported Female First. For latest Music updates follow us on Twitter >>> @TOIEntertain For the latest in Music news, like us on Facebook >>> TOIEntertain "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," she said. Listen to Selena Gomez on Gaana.com WATCH: Selena Gomez - Good For You