The 'Girls' star and her Fun. guitarist boyfriend have been together for three years and are very supportive of one another and claims their relationship works so well because they haven't tried to change one another.
She said: ''It's really nice to have somebody who supports and loves you who is connected to every aspect of your life.
''In the best relationships, you remain yourself. You just have a more pleasant ride of it.''
Although she is very happy with Jack, the 28-year-old actress insists she's in no hurry to get married and insists it has never been her dream to have a big white wedding.
Speaking to HELLO! magazine, she explained: ''I was never the person who grew up saying, 'I can't wait for my wedding'.
''Weddings are lovely and a great excuse to dance and eat food and scream at people, but then you have to get married.''
Lena also plans to stick to her promise that she will only tie the knot once gay people have the same rights to wed across the whole of America just as she and Jack, 30, do.
She explained: ''I don't want to get married until it's possible for everyone - no matter what their sexuality is - to marry all over the US. I don't have any interest in doing it until then.''
This overlong comedy is so episodic that watching it is exactly like sitting through five...