Stella McCartney has a new fashion bug.

The top designer has given birth to her third child with husband Alasdhair Willis. Beckett Robert Lee arrived on Tuesday in London and makes Stella’s Beatle dad Paul McCartney a grandfather for the fifth time (his daughter Mary has two sons).

Stella, 36, and Alasdhair, a publisher, are keeping their kids close in age. The two are already parents to son Miller, 2, and daughter Bailey, 1.

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