Lena Dunham has sparked rumours she is engaged.

The 'Girls' creator has been dating Jack Antonoff from the group fun. since 2012, but speculation they have taken their relationship to the next level has been increasing in the past week as she has been spotted on several occasions wearing a band on her ring finger.

The Golden Globe winner posted an image of herself on Instagram wearing the ring, and was spotted running errands in New York while sporting the same diamond, despite previous claims they would not marry until gay marriage was legal.

After moving in with each other last year, the 28-year-old actress admitted marriage was something they had considered, but was not something they wanted to embark on until her lesbian sister, Grace, was able to get hitched.

She said: ''We're not against marriage, but I want to wait until it's something - my sister's gay and it just doesn't feel good to me to do something she can't do.

''She can do it in some places but not all places.''

However, the couple have certainly been growing closer in the past year, with Lena describing the 30-year-old musician - who is also in the band Bleachers - as her ''life partner'' and explaining how he has made her feel more stable and mature.

She said: ''I feel the more I'm alone, the more I turn into this rageful, hardened-shell of a woman...I never get the feeling of like, 'Oh I wanna go out and', I'm never like, 'I wanna go out and f**k little boys...I wanna stay in and re-read 'Madame Bovary' and never speak to anyone again. My boyfriend is definitely the person who prevents me from doing that.''