The Wilson Phillips singer told PopEater that she has learnt to accept her changing size and tries not to worry too much about it.
"I'm fat as f**k, what can I say?" she explained.
"You know, after all these years, it's just like we are who we are and it's a struggle for me and sometimes I'm heavier and sometimes I'm thinner."
Wilson underwent gastric bypass surgery in 1999, subsequently losing 150lbs before gaining back the weight in the years following.