Sheer Madness! Pregnant Blac Chyna Bares Her Booty In See-Through Pants

Blac Chyna recently announced she's gained 20 pounds since announcing her pregnancy. And it looks like she hasn't bought new pants! Her bottoms struggled to contain her booty in L.A. this week, and RadarOnline.com has the photos.

The 27-year-old former stripper wore a pair of granny panties under the seriously stretched-out pants.

Blac shared her joy over the baby on her Instagram page Tuesday morning, writing a rambling rant: "For a long time I felt like King was going to be an only child. That he was my greatest blessing and we were gonna live happily ever after together Just the 2 of us, I was no longer looking for love because I thought I had all that I needed. We needed. But look at God ! Here I am Engaged to be married to one of the greatest men I know who loves King & I unconditionally AND having another bundle of joy! I just want to say Never give up & ALWAYS have faith because fairytales DO come True."

Her fiancé was spotted looking slimmed down in an all-black outfit too.

Do you think Blac and Rob are going to put their baby on KUWTK? Sound off in the comments.