I’m pretty sure this is an American Painted Lady butterfly.
They’re common, but tough to photograph since they rarely sit still for more than a second or two, if that. Normally they’re flitting and fluttering and doing butterfly things as they drift past you in the air.
For whatever reason this one kept landing at my feet when I already had my phone/camera out for something else. So, okay – it’s ready for its closeup!
Happy to oblige.