I couldn't figure out how to write the title but it took Britney awhile to promote Hold It Against Me and Till The World Ends in the FF era and she never performed Work Bitch at the GMA or Billboard in the Britney Jean era. So is the reason why Britney's performed Pretty Girls because she knows she's not releasing an album any time soon?

There might be an album coming. Britney and Iggy both said that "Pretty Girls" is the lead single for the album recently, but back in May Britney's manager said that they were just releasing singles as they came, so...

There is an album coming.

they might have just seen it as a way to promo the single and vegas residency. i don't think it's because there's no album or anything like that.

She promoted Vegas not the song. It's what she had been doing since 2012 lol