Dominik Bindl, Getty Images
But it was the finale episode's star-studded performance lineup that really stole the show. Rihanna, Bruno Mars, Kelly Clarkson, Avril Lavigne, Smokey Robinson, the Killers and Peter Frampton all hit the stage. Check out our favorite performances from last night's pop acts in the videos below!
Watch Rihanna Perform "Diamonds"
Watch Bruno Mars Perform "When I Was Your Man"
Watch Cassadee Pope Duet With Her Idol Avril Lavigne on "I'm With You"
Watch Cassadee Pope and Terry McDermott Perform "Catch My Breath" With Kelly Clarkson
See Rihanna's Most Shocking Twitter and Facebook Photos
- Can You Believe They're the Same Age?
- Lindsay Lohan and Dianna Agron
- Adele and Hayley Williams
- Florence Welch and Lea Michele
- Lady Gaga and Mary-Kate Olsen
- Fantasia Barrino and Avril Lavigne
- Miranda Cosgrove and Taylor Momsen
- T-Pain and Carly Rae Jepsen
- Can You Believe They're Related?
- Miley and Trace Cyrus
- Jessica and Ashlee Simpson
- Britney and Bryan Spears
- Vanessa and Angela Simmons
- Jonas Brothers and Frankie Jonas
- Natasha and Daniel Beddingfield
- Ashanti and Kenashia Douglas
- Guys Who Love Wearing Makeup
- Adam Lambert
- 30 Seconds to Mars' Jared Leto
- Robbie Williams
- Green Day's Billie Joe Armstrong
- Pete Wentz
- Zac Efron
- The Killers' Brandon Flowers
- Boy George
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