The singer put on an eye-catching in a plunging red printed mini dress as she joined stars including Anna Kendrick, Vanessa Kirby, Demi Moore and Rosie Huntington-Whiteley at the party at London ...

Anna Kendrick dazzled with a red silk mini dress with a v-neck cut out. She paired the romantic look with a matching curved bag and black stilettos - the perfect late Valentines day look.

The other has a strapless dress with a dark bodice "Blake Lively and Anna Kendrick before they walk the red varpet at the sxsw Another Simple Favor premiere," the tweet read. "I just reported on ...