Ono Lennon and girlfriend Charlotte Kemp Muhl shared the new on Tuesday night (Sept. 1).

(L-R) Yoko Ono, Sean Lennon and Charlotte Kemp Muhl attend Threeasfour's spring 2010 runway show.

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Sean Ono Lennon and longtime girlfriend Charlotte Kemp Muhl announced the birth of their first child, a boy, on Tuesday night (Sept. 1). The news came in an Instagram post from the couple in which they proudly cradled their bundle of joy between them with the caption, “@charlottekempmuhl and I have created a Human Bean! His name is Aurelius. Thank You!”