'American Idol': Ex-Boybander Brings Katy Perry to Her Feet in New Sneak Peek (Exclusive)

American Idol: Katy Perry compares Cassandra Coleman to friend Florence Welch as she enters Top 24

'American Idol': Twitter Reacts to Heartbreaking Elimination & Katy Perry Look-Alike's Miley Cyrus Cover

Pregnant Ellie Goulding reveals Katy Perry and Princess Eugenie have been giving 'excellent advice'