The pop singer and husband Sam Cooper welcomed the sister for the first daughter Ethel on Tuesday.
“Marnie is a real cutie. Sam and Lily are ecstatic about adding another girl to the family,” a source was quoted saying in The Sun.
Marnie Rose, who shares her Smile singer mother’s middle name, will also celebrate the same birthday as David Bowie and Elvis Presley.
Lily is currently working on a new album after taking a break from the music industry.
Image via Getty