Are her father's comments the reason why RiRi looks slimmer these days?

According to latest rumors,
Rihanna's father spoke to the media a while back and he had some not-so-nice words to say about his daughters weight.
"I actually thought she was a little fat last time I saw her",
Ronald Fenty said.
"When I saw her this time, I thought she was back to her normal size. I used to joke with her "Robyn, you're getting too fat!" But I think she's fine, I think she looked excellent, as everyone saw, at the Grammys. She's dieting, she's working out.", he
added.
Take a look at a picture of Rihanna from May 2011 and one from the 2012 Grammy Awards where she looked noticeably slimmer.
Do you guys think RiRi was getting "too fat"?
What are your thoughts on her father's comments? Make sure to follow 6lyrics on Twitter and Facebook!