In the April 13 "Teen Mom OG" Episode 4, "Big News," there were baby bombshells galore. Maci Bookout revealed to show producers that she's pregnant. Gary Shirley told Amber Portwood that his girlfriend, Kristina, is also pregnant.

The cutest moment of the show was when Bookout told her son, Bentley, that there's a baby in her tummy and he's going to be a big brother. "It's not in there!" he told his mother. Next, he asked for proof. Bookout showed him a picture. Bentley believed her and got excited.

If you missed Portwood's shock to Shirley's bombshell that he and Kristina are having a baby, you can watch a sneak peek of her reaction. She handled the news better than expected, but scolded her ex-boyfriend for saying that he had no plan to get married.

Doctors gave Catelynn Lowell a stern talking to about her poor eating habits.

Have you missed "Teen Mom" alum Farrah Abraham? Abraham returns to Season 5 of MTV's "Teen Mom OG" on Monday, April 20, reports Perez Hilton.

The 23-year-old former porn star revealed her return to the show during the 2015 MTV Movie Awards.

"This is Teen Mom OG, and it has a different editing. You can see the [fourth wall], and we've definitely shown more intricacies with the cast, so it's not just our storylines, and everyone is kind of integrating together, and I think that that's way special," she said.

"So April 20th I will be back on "Teen Mom OG" so tune in then," Farrah continues. "You'll see what's really going on."

The controversial star was initially cut from the show due to her recent career endeavors (Abraham's X-rated tape, erotic novel and sex toy line), but she was invited to return once producers realized she was crucial to the show's storyline, according to Perez Hilton.

Reportedly, Abraham's boyfriend, Simon Saran, will appear on the show at some point.

Not all of Abraham's co-stars are thrilled with her return. In March, Bookout told USA Today, "I'm not going to lie and say I was happy about it. I mean, it's something that I guess people will just have to watch on the show. And it has nothing to personally do with Farrah at all. I have no hard feelings towards her whatsoever."

Watch "Teen Mom OG" Episode 5, "Surprise Surprise," Monday, April 20, at 10 p.m. ET on MTV.