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Wiktionary
pretty up

vb. (context idiomatic English) to prettify, to make pretty or prettier

WordNet
pretty up

v. use special care in dressing, making-up, etc.; "She dolled herself up for the night out with her friends" [syn: doll up, do up, glam up]

Usage examples of "pretty up".

I mean, they've been pretty up front, letting us send delegations off world and giving material help, now even offering off-planet evacuation for dependents.

But she knew that she had better pretty up so she sat down at the vanity.