Last weekend, Justin jetted to San Francisco for the star-packed 40th birthday celebration that Robert Downey tossed for his wife, Susan. Aniston appeared to be a no-show at the party, which brought out everyone from Gwyneth Paltrow to Reese Witherspoon.
But it was Theroux's supposedly "close affection" with the blonde that was "the talk of the party," alleges a spy (we think his friendly food-sharing with pal Jason Bateman was far more compelling).
Anyhoo, a source scoffs to Gossip Cop that the blonde is question was actually Sting's wife, Trudie Styler, and she was merely saying goodbye to Justin, who's a longtime friend. Suggestions of anything untoward are "ridiculous," huffs the confidante.
Be sure to keep clicking for more photos of J'Theroux ...