Selena Gomez: 'Britney Spears song is honour'

Selena Gomez has said that it's an "honour" to have a song co-written by Britney Spears on her record.

Spears helped pen the track 'Whiplash', which appears on Selena Gomez & The Scene's third studio album When The Sun Goes Down.

During an appearance on GMA this morning, Gomez said: "I didn't know [she had written it]. I heard the song and fell in love with it, I thought it was fun and catchy. I went into the studio and it said 'co-written by Britney Spears' and I almost had a heart attack!"

She added: "It's an honour and I'm very excited for people to hear it."

Gomez also confirmed that she is still planning a Britney Spears tribute during her summer tour, saying: "Even if you're a guy you know Britney songs so I'm excited."

Spears kicked off her 'Femme Fatale Tour' in Sacramento on Thursday night, receiving rave reviews from a string of critics. She recently announced that the music video for new single 'I Wanna Go' will premiere on June 22.

Gomez, 18, was on GMA to take part in the 'Summer Concert Series', which has already paid host to Lady GaGa and Jennifer Hudson. Other artists scheduled to perform at the event in Central Park include Nicki Minaj and Beyoncé.

> Selena Gomez, Hilary Duff attend Britney Spears gala

Watch Selena Gomez & The Scene perform 'Who Says' at the GMA Summer Concert Series: