Katy Manning (in-universe)

A cloaked figure once surveyed images of the Doctor's friends and companions, with one of them depicting a blonde woman posing nude with a Grey Dalek. (COMIC: Unnatural Selection)

When Simon encountered a older version of the he was travelling with that he didn't immediately recognise, he thought that she had the look of "someone famous". (PROSE: Enter Wildthyme)

Behind the scenes
Whether the blonde woman is supposed to be Jo Grant or an in-universe Katy Manning is ultimately unclear, but since the image is an almost 1:1 of the same infamous photo of Katy Manning posing nude, it is more likely to be the latter. Especially as Jo Grant somehow posing nude next to a real Dalek would be highly unlikely.

Additionally, the blurbs for Iris Wildthyme and the Celestial Omnibus and the charity anthology Bafflement and Devotion: Iris at the Edges describes Iris Wildthyme as looking like the "spitting image" or the "alter-ego" of Katy Manning.

Katy Manning also played "herself" in The Five(ish) Doctors Reboot.