Five years ago, Pink had that "kinda thick, semi-muscular hot" look. Just lean enough but definitely carried some muscle. She was 30 at the time. Still hungry, still working ass off to make her mark in the world - she was hungry.
Common sense says... By the time she hits 35, and the metabolism drops off... she's not going to do the same and look the same. She's a millionaire, doesn't have to stress and work 24/7 for it. Time to enjoy it a bit. So yeah, she's going to bulk up a bit. I bet she'll go thru some leaning phase for a photo shoot... look all skinny for a Cosmo cover... and keep on the up and down weight loss thing for another 5 years.