Brad Paisley, Carrie Underwood Brad Paisley, Carrie Underwood

The CMA Awards are held to celebrate the best in country music, but it was pop stars Ariana Grande and Meghan Trainor who stole the spotlight atWednesday's ceremony.

Grande performed "Bang Bang" with Little Big Town in what felt like a forced, uncomfortable collaboration (see below), and Trainor and Miranda Lambertteamed up for "All About That Bass."

Photos: The hottest red carpet looks from the CMA Awards

Speaking of pop music, hosts Brad Paisley and Carrie Underwood took the opportunity to gently rib their onetime country comrade Taylor Swift, who's gone full pop with her latest effort, 1989. Quipping that they were suffering from "Post-Partum Taylor Swift Disorder," the duo sang a musical tribute to the 25-year-old singer that featured the line "New York's gain is Nashville's loss / Country music is just gonna have to shake it off."

Paisley and Underwood also touched on Ebola in their opening remarks, reworking Dolly Parton's classic "Jolene" to be "Quarantine." And, Paisley mayhave let it slip that Underwood's expecting a boy, when he suggested the name "Garth."

The night's big winners included Luke Bryan, who won Entertainer of the Year, and Little Big Town, who won Vocal Group of the Year. Country power coupleBlake Shelton and Lambert won Male and Female Vocalists of the Year, respectively, and Lambert also won Album of the Year for Platinum and Single of the Year for "Automatic." See a complete list of winners here.

Watch Paisley and Underwood's opening monologue: