Charlie Puth stunned on stage and had some fun with Gabby Diaz backstage. They harmonize, talk birthdays, and then he turns the mics to interview her. 1 of 242 of 243 of 244 of 245 of 246 of 247 of 248 of 249 of 2410 of 2411 of 2412 of 2413 of 2414 of 2415 of 2416 of 2417 of 2418 of 2419 of 2420 of 2421 of 2422 of 2423 of 2424 of 24