This didn't take long.

After reading Kanye's random Tweet on abortion early Thursday, we knew it was only a matter of time before the backlash started, and Lily Allen was the first celeb to respond. When you Tweet about a topic as sensitive as abortion, you'd better expect a lot of people to get p.o.'d.

West Tweeted yesterday:

    "An abortion can cost a ballin' n**** up to 50gs maybe a 100 ... Gold diggin' b****** be getting pregnant on purpose. #STRAPUP my n*****!"

Is he hinting at something that's happened in his personal life recently? Otherwise we can't understand where this comment is coming from.

Allen, who has already suffered two miscarriages, re-Tweeted Kanye right back, condemning him for his offbeat remarks.

The 25-year-old pop singer expressed:

    "Never has a tweet put me in such a bad mood. This is wrong on so many levels."

Maybe Kanye will learn to keep his Twitter a bit more PC next time ... we hope.