Chuffed Roman was with his Russian socialite girlfriend Dasha Zhukova, 31, throughout her labour, and at her side as she delivered his latest signing – a little girl named Leah Lou.
The couple already have a son Aaron, three, and Roman has two sons and three daughters with his former wife Irina.
A source close to the couple told the Mirror that Roman was 'delighted' with his new little girl, and that 'mother and daughter are doing fine' after the birth in New York last week.
Mr Abramovich, 46, has been married and divorced three times, and got together with magazine editor and fashion label boss Dasha after meeting her at a New Year's Eve party in 2006.
Suggested For You
SUBSCRIBE AND FOLLOW
Get top stories and blog posts emailed to me each day. Newsletters may offer personalized content or advertisements.Learn more