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The new mommy also tweeted, "Totes [totally] Amaze [amazing]," leading many to believe the happy baby news is true.
The birth of Allen's daughter marks a joyful chapter in the singers rocky fertility journey. Just last October, Lily and her husband, Sam Cooper, were devastated after the 'Friday Night' songstress miscarried their unborn son six months into her pregnancy. The loss came two years after Lily suffered her first miscarriage with then-boyfriend Ed Simons.
Congrats to Allen and her growing family. We can't wait to see photos of the "mini Lily!"
Watch Lily Allen's 'Not Fair' Video