Scott will be on loan from Manchester City to Villa until the end of the season.
Four WSL clubs were interested in signing the Englishman.
After losing her place in the starting line-up at City, Scott wanted to go on a loan to get herself ready for the Euros.
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Scott has over 150 senior caps for England and a WSL title with City.
She is the second signing of the January window, following the arrival of Anna Patten.
When we heard of the availability, it was a no-brainer.
To have the chance to acquire one of England's most decorated footballers is a chance we couldn't refuse.
Jill will bring so much to this group, not only on the pitch, but I see her having a huge impact off it.
We have some hugely exciting young talents coming through, so for them to learn from someone of their stature will be massive.
Scott helped Manchester City to three Women's FA Cups and three Continental Tyres Cups in eight-and-a-half years at the club, as well as winning one WSL title.
Everyone at City would like to wishJill the best during her loan spell and for the rest of the season.
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Who will be moving in January?
The January transfer window closes at 11pm on Monday January 31.
Sky Sports has a dedicated Transfer Centre blog where you can keep up-to-date with all the latest transfer news. Sky Sports News has the ins, outs and analysis.