Adele.

People are buying The Collection rather than The Monster Ball DVD so Adele if you're talking strictly about DVD sales.

I would have got The Collection but it's not blu ray.

It's between Gaga and Adele.

1.Britney
2.Adele
3.Beyonce

Never ,honey.

Even more imposibble with that cover

1. Gaga
2. Adele
3. Beyonce
4. Britney

Taylor's will outsell them all

Adele is never touching Beyonce or Gaga for that matter in DVD sales. Beyonce usually sells enough to be 2x platinum during the opening week.

Nobody in this generation of performers has sold more live performance DVDs than Beyonce, and that isn't changing anytime soon. The Beyonce Experience is still selling, and so is the I Am...Tour.

Adele has never released a DVD

Overall, Beyonce is #70 while Adele is #74. but Adele also has a Blu-ray version at #274.....

I think that Gaga won't sell the more than Adele/Beyonce, b/c her fans are buying The Collection. (I already pre-ordered it)

Adele
Gaga
Beyonce
Britney

embarrassed for Britney cover compared to the other 3...
well, Gaga's looks silly, but at least it doesn't have extra pics on the front

Elements of 4. Beyoncé's I Am... World Tour became the best selling music DVD of 2010 in just five weeks. Don't underestimate Beyoncé DVD selling power of her concert DVD's.

but also don't forget that lots of people wanted to see adele this year, but she either tour some small venue or cancelled them due to illness.
i think lots of people would want to see what they missed

It'll most likely go like this -

1. Bee
2. Adele
The others

From the most to the least talented.