Celebrity pictures: Scarlett Johansson, Tom Jones, Kylie

Today's celebrity pictures include screen siren Scarlett Johansson arriving for the premiere of The Avengers in London, a sexy Kylie Minogue shoots her new music video in Soho, TOWIE's Lydia Bright goes clubbing and The Voice's Sir Tom Jones attends a TV screening.

Across the pond in Los Angeles, original 90210 cast members Shannen Doherty, Jennie Garth and Ian Ziering go to Garth's 40th birthday bash, and a bedraggled Penn Badgley is spotted out and about with friends.

And in New York, a dapper Alec Baldwin attends the Tisch School Of The Art's Gala 2012, Natasha Bedingfield and Emily Blunt are at the Tribeca Film Festival screening of Your Sister's Sister and Winona Ryder visits the Loomstate 321 Earthday Celebration.