November 29, 2010 03:15 PM

Nick Harvey/WireImage

It’s a girl for Stella McCartney!

The fashion designer and husband Alasdhair Willis welcomed their fourth child, daughter Reiley Dilys Stella, on Tuesday, Nov. 23 in London, her rep confirms to PEOPLE. The baby girl weighed in at 8 lbs.

The couple, who wed in 2003, are already parents to son Miller Alasdhair James, 5½, daughter Bailey Linda Olwyn, 4 next week, and son Beckett Robert Lee, 2½.

McCartney, 39, is a celebrity baby herself — dad is Beatles legend Paul McCartney.

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