The attack cost three people their lives and left nine others seriously injured.
The alleged shooter, Robert Lewis Dear, 57, has since appeared in court accused of the crime.
Lawrence, who has never been afraid of speaking out on issues which are important to her, added, "It's so awful It isn't an attack on abortions; it's an attack on women. Because Planned Parenthood is so much more.
"Seriously, what harm comes from supplying people with birth control, condoms, Pap smears, and cancer screenings?" she asked.
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Lawrence admitted she no longer needs contraception as she's a "virgin" again, having been single for so long.
"I'm picky," she admitted. "I feel a spark very, very rarely. And it's really only about spark for me. Not really anything else. You should see some of the people I find attractive.
You'd be shocked."
The Hunger Games actress previously dated British actor Nicholas Hoult, and last year was linked to Coldplay frontman Chris Martin.
- AAP