Marnie Rose is the sister to Lily's first baby,Ethel Mary, who turned 1 back in November. Unlike most celebs she didn't reveal the news via Twitter, rather The Sun was the vehicle used to let everyone know.

A 'pal' of the star told the paper that "Marnie is a real cutie." And, that "Sam and Lily are ecstatic about adding another girl to the family. "A little sister for Ethel is brilliant news to lift the January blues for the family." 

While she didn't use Twitter to break the news, she has used the social networking site to air her pregnancy grievances and thoughts. Marnie Rose is a couple of weeks late, so she left a couple of tweets about her plans for her birth.

Although Allen now has two children, she suffered a miscarriage in 2010 with her ex-partner. Having spent three years pregnant, she joked about 2013, saying:

Congrats to Lily and the rest of the family! And we hope Lily enjoys her pregnant-free year.