Proud Sir Richard described it as "the most magical day" in his Virgin blog, adding: "It is absolutely wonderful that Holly and Freddie have a boy and a girl – Etta and Artie... They are the most beautiful babes ever to be born in the whole wide world.
"Freddie and Holly have spent a perfect first Christmas with the twins."
Holly, meanwhile, described her babies as "absolutely perfect", jokingly adding: "But who wouldn't that about their kids?!"
She wrote in her Virgin blog: "Despite being delivered early, all three of us are fit and well and Freddie and I are now enjoying some quality time with our newly formed family. What's more, the little ones also arrived on mine and Freddie's third wedding anniversary - could there be a better way to mark the occasion?"
Congrats to Holly and Freddie!
Holly and husband Freddie Andrews welcomed daughter Etta and son Artie on 20 December – the same day as their wedding anniversary and that of Sir Richard and his wife Joan!
Sir Richard, 64, will become a grandfather again in the New Year when his son Sam's wife Isabella gives birth to their first child.