Rumer Willis has insisted she didn't become sober because of a "substance abuse problem"

She said: "My decision to become sober wasn't out of a need necessarily, it was more just that I did 'sober January' and I just decided to keep going.

"I wouldn't consider saying I had a substance abuse problem by any means."

Rumer also admitted people were too quick to "presume and assume" that she was abstaining from a particular thing.

Speaking to PEOPLE Now, she added: "I didn't say I was sober from anything, I could have been sober from a food addiction or buying too many clothes or from relationships or whatever, but I think we're in this culture where we naturally presume and assume."

In July, the 'House Bunny' actress admitted she was "proud" to have been sober for six months.

She wrote on Instagram: "I will be the first one to say I'm not perfect and I mess up sometimes and every once in a while I get it right but I wanted to share this because I am really proud of myself. Yesterday I celebrated 6 Months of Sobriety.

"It's not something I planned on but after the long journey of getting here I can honestly say I have never been more proud of myself in my entire life. Thank you all for the love and support and remember to be gentle with yourself.(sic)"