The American, 38, has never played in the competition before but will join French Open champion Ashleigh Barty and world number one Naomi Osaka in the draw as the build-up to Wimbledon continues.
"I'm really excited to be playing in Birmingham for the first time. I always love playing on grass in front of British crowds and have heard wonderful things about the tournament," the seven-times Grand Slam singles champion said.

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Nature Valley Classic
Barty secures world number one ranking with Birmingham victory over Goerges
23/06/2019 AT 13:40
Briton Johanna will take to the grass at Birmingham following her amazing run to the French Open semi-finals.
Czech Petra Kvitova, a double Wimbledon champion, is also playing, but Spain's former Wimbledon champion Garbine Muguruza has withdrawn because of a left leg injury.
The tournament runs from June 15-22, and will be shown live on Eurosport.
Nature Valley Classic
Barty to face Goerges for Birmingham title and World No.1 spot
22/06/2019 AT 14:54
Nature Valley Classic
Barty closes in on No. 1 spot with victory over Venus
21/06/2019 AT 18:19