There was lots of talk that Kate Moss might be jumping on the Chanel/Fendi bandwagon, after she was spotted at strictly Karl Lagerfeld-only events during Paris Fashion Week. But after pics of the supermodel on a shoot for YSL emerged this week (above, left) it's now clear that she's sticking by her pal Stefano Pilati. Although, it has been confirmed that the shoot wasn't for YSL's A/W '09 campaign, but for something else... I wonder what it could be?

Still dressed in the YSL tuxedo jacket from the shoot, Kate then joined her other old pal, Sir Philip Green (above, right), to celebrate his 57th birthday back in London.

The pair, along with Mark & Spencer's Sir Stuart Rose, partied into the wee hours at Annabel's nightclub in Mayfair. Oh, to be a fly on the wall...

[Photos: Source / WENN]