Paparazzi photos from Thursday, April 21

Christina Aguilera arriving at The Abbey in West Hollywood (pics start here)

Simon Baker filming The Mentalist at Burbank Town Center (pics start here)

Amber Lancaster at the launch party of the new T-Mobile Sidekick 4G held in Beverly Hills (pics start here)

Pixie Lott arriving at Heathrow Airport from L.A. (pics start here)

Coco shopping in the Meatpacking District of New York (pics start here)

Adrienne Bailon out and about in New York (pics start here)

Amanda Seyfried leaving Urth Caffé in West Hollywood (pics start here)

Selma Blair leaving Urth Caffé in West Hollywood (pics start here)

Chelsea Kane and Mark Ballas leaving Dancing with the Stars practice at a studio in Hollywood (pics start here)

Selita Ebanks at OK Magazine's celebration of Hollywood's Sexiest Singles party in New York (pics start here)

Anna Paquin leaving the Kate Somerville Skin Health Experts Clinic in West Hollywood (pics start here)

John Cusack out and about in Brentwood (pics start here)

Sophie Monk at the crowning of the Cleo Magazine 2011 Bachelor of the Year Award at The Ivy in Sydney, Australia (pics start here)

*111 paparazzi pictures total in the gallery: [Flynet, WENN, Pacific Coast News]