Chelsea ended the Women's Super League season unbeaten after Aggie Beever-Jones's stoppage-time goal secured a 1-0 win over Liverpool at Stamford Bridge on Saturday.
The Blues had wrapped up the title – their sixth in a row – with two games to spare as French manager Sonia Bompastor ensured the London club remained at the summit of the English game in her first season since succeeding Emma Hayes.
But they were kept waiting for a goal by Liverpool before academy product Beever-Jones fired in a late winner as Chelsea became the first side to remain unbeaten in a 22-match WSL campaign.
Bompastor's team lifted the trophy after the match.
Chelsea, who also won the League Cup, will aim to complete a domestic treble when they face Manchester United in the FA Cup final on May 18.
Their hopes of a quadruple were scuppered when they lost 8-2 on aggregate to Barcelona in the semifinals of the Women's Champions League.
Arsenal finished as runners-up with a 4-3 win over Manchester United at the Emirates Stadium despite a late fightback by the visitors.