Scott captioned the picture: ‘Best day of my life.’ 24-year-old Helen is believed to have given birth on Monday.
The former Coronation Street star is now resting up in a hospital in Birmingham, say The Sun.
The star confirmed that she was pregnant on 22 December.
"Me and Scott are expecting our first baby in the summer.
Helen Flanagan has welcomed her first child with boyfriend Scott Sinclair.
The couple announced the arrival of their daughter Matilda Jessica Sinclair on social media, sharing a cute Instagram snap of the young family.
The mum-to-be was pictured cradling her baby bump as she posed for photographers before making her way into the party.
In 2010, Flanagan appeared in Coronation Street spin-off Coronation Street: A Knights Tale as her character Rosie Webster.We are both so happy and so excited xxx," she revealed.It is Helen's first pregnancy with partner Scott Sinclair.It is hoped that she’ll be back home in a day or so.’ The glamour model was nearly two weeks overdue.In an anxious Instagram post on Friday she said: ‘Can’t wait to hold our baby girl or baby boy.’ Flanagan, who has been dating Scott since 2009, announced her pregnancy in December.