The 49-year-old star lost her mom Joan in September 2014 after complications following a routine endoscopy in New York and Melissa admits it sometimes feels like it happened only days ago whereas other times it feels like it was 10 years ago.
She said: ''There are some days that it feels like 10 years and some days where it feels like yesterday. But that's the normal grieving process. Everyone expects me to have this sort of elevated or heightened experience, and the truth is - and I say this all the time - grief is grief is grief. It doesn't matter if you're in the public eye or a private person, it goes at your own pace.''
And Melissa's son Cooper, 16, is missing his grandma too.
Speaking on The Today Show, Melissa added: ''She was the one he went to when he was annoyed with me, so now as a 16-year-old boy, he would be on the phone all the time.
''My mom says I'm much stricter with Cooper than she was with me, which is crazy because I spent a good part of high school grounded. She would tell me I'm a better parent than she was, and I don't think I am - I think I'm just different.''
It comes after Melissa revealed she knows her mother Joan would be ''so proud'' of her grandson.
She wrote on Twitter: ''Thank you all for the love today. Hard to believe it's 2 yrs. Coop & I miss her every day. One thing I know is my mom would be so proud of the young man Coop has become. That makes me smile even today xx (sic)''
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