lallenpart2100310_01_X17WM230.jpgLily Allen has kept the name of her newborn daughter under wraps for five weeks, but her mom, Allison, has let the cat out of the bag. Lily's mom reportedly posted the name of her granddaughter on Facebook. Yikes!

The 26-year-old "Smile" singer has named her first child Ethel Mary, according to British reports.

Allen and her hubby Sam Cooper welcomed baby Ethel on November 25. Lily Tweeted:

    "Thank you for all the flowers and lovely messages everybody," she wrote. "Very touching indeed."

Prior to delivering Ethel, Allen suffered a miscarriage in 2008 and delivered a stillborn baby in 2010.