LOS ANGELES Mariah Carey made a surprise appearance at the Los Angeles premiere of “Hercules” – where the singer got a big smooch from star Dwayne Johnson. Later she was seen making her way to the after party on the arm of the movie’s director Brett Ratner. It was a big night for The Rock who happily signed autographs for a huge line of fans. Also spotted at the festivities: Eddie Murphy, Carla Gugino, Sugar Ray Leonard, Ian McShane, Vivica A Fox and Kylie Minogue – who gave the flick a big thumbs up. :20 Kylie Minogue: fantastic, you have to see it NEW YORK Ryan Seacrest had some exciting news to share in the Big Apple. The TV host revealed the star-studded line up for the next iHeartRadio concert - happening at the MGM Grand Hotel in Las Vegas. Among the big names set to perform: Taylor Swift, Coldplay, Usher, One Direction, Nicki Minaj, Motley Crue, Lorde, The Zac Brown Band and Ariana Grande. Elsewhere in the city, Rose Byrne was on the promotional trail for her upcoming Broadway play “You Can’t Take It With You”. LONDON Cheryl Cole has a new name and a new fragrance. The singer is now known as Cheryl Fernandez Versini after recently tying the knot. And she sported a wedding inspired gown at the launch event for her perfume StormFlower.