Kate Moss leaving her home to celebrate her 35th birthday. London, England - 16.01.09

The catwalk beauty was enjoying her private party at London's Dorchester Hotel when she reportedly spotted the star drinking in the venue's bar and invited him to join the event.

And Richie got into the spirit of the night by serenading Moss with several of his hit songs, including All Night Long, according to British newspaper the Daily Mirror.

Moss followed up her birthday extravaganza the following day (16Jan09) with a medieval-themed houseparty at her north London home.

Guests included fashion designer Stella McCartney and Rolling Stones star Ronnie Wood.

Source: WENN