Fashionistas and movie stars alike have descended on London for the BAFTA Awards and London Fashion Week.

Among hotly tipped parties, Harvey Weinstein is planning a BAFTAs after-party Sunday at the Rosewood Hotel and has booked Lisa Fischer, who stars in his Oscar-nominated doc “20 Feet From Stardom,” to perform.

Fischer has been a backup singer with the Rolling Stones for 25 years and will arrive at the party from Paris, where she’s been rehearsing with Mick Jagger and company before they all head to Abu Dhabi to begin touring Friday.

Other notable bashes included Charles Finch’s annual dinner Saturday at private club Annabel’s for expected guests including Sandra Bullock, Bradley Cooper, ­Lupita Nyong’o and Julian Schnabel.

Earlier in the day, “Love Actually” producer Eric Fellner co-hosted a lunch at Chiltern Firehouse, where Kate Moss, Naomi Campbell, Keira Knightley, Bono and Damien Hirst have been seen hanging during London Fashion Week, even though the hotel has yet to officially open its doors.