What is mrs lovetts name in real life?

It depends. You put this in Twilight Book Series. That's a strange category. The Sweeney Todd:Demon Barber of Fleet Streer(2007) Mrs. Lovett's real name is Helena Bonham Carter.

If you aren't fimiliar with her try these as other movies she's been in:

Corpse Bride...........................................................Emily / the corpse bride

Alice in Wonderland................................................The Red Queen

Harry Potter.............................................................Bellatrix Lestrange

Toast.......................................................................Joan Potter

The King's Speech...................................................Queen Elizabeth

Termanator Salvation..............................................Dr. Serena Kogan

The Gruffalo.............................................................Mother Squirrel

Enid.........................................................................Enid Blyton

Sixty Six...................................................................Esther Reubens

Magnificent 7...........................................................Maggi Jackson

Wallace & Grommit: The curse of the Were-Rabbit..Lady Tottington

Charlie and the Chocolate Factory(2005)................Mrs. Bucket

Big Fish....................................................................Jenny---young/Jenny--old/the witch

Henry Vlll.................................................................Anne Boleyn

Live from Baghdad..................................................Ingrid Formanek

Carnivale.................................................................Milly

Frankenstine(1994)

A room with a view

and many many more...