Naomi Watts at Elton John's White Tie Ball Pictures

Naomi Watts stepped out in London last night to attend Elton John's White Tie & Tiara Ball in support of the Elton John AIDS Foundation. The actress, who calls NYC her home base most of the time, is prepping for her new role as Princess Diana in England. She headed to the UK shortly after attending the Cannes Film Festival in May, and just a few weeks ago attended Glamour UK's Women of the Year Awards in London. Naomi's project about Diana, Caught in Flight, will follow the last two years of her life.

Last night, Naomi took a break from her busy work schedule and joined stars from the worlds of music and fashion inside the Chopard-sponsored soiree. Naomi, in Marchesa, was also seen posing with Elton and his longtime love, husband David Furnish, inside the bash.