Avril Lavigne, 42, secretly welcomes first baby and shares adorable photo

Avril Lavigne has welcomed her first child (Picture: Taylor Hill/Getty Images) Avril Lavigne has revealed she secretly welcomed a baby with her mystery partner. The 42-year-old singer declared their ‘mini princess has arrived’ and shared snaps of the newborn. One picture saw the I’m With You singer holding her baby, who was rocking a leopard-print onesie with a matching headband. Another very…