Wedding bells rang during last night's episode of MTV's "Teen Mom OG" when Catelynn Lowell and Tyler Baltierra tied the knot in a beautiful ceremony in Michigan. Their fellow costars Maci Bookout and Amber Portwood were also in attendance - except for Farrah Abraham, who spent her time preparing for her trip the UK to film "Celebrity Big Brother" and managed to make her mother Debra cry again.

Maci Bookout

Bookout's live-in boyfriend Taylor McKinney finally realized his dream of owning a clothing line, and he bought and took over the brand he had his eyes on, even though Bookout warned him not to. Now that McKinney owned the clothing line, Bookout stepped in to help him run it, which led her to taking over as art director and also planning the first photo shoot.

"I have, like, planned this entire photo shoot and been doing everything," Bookout complained to a friend. "My name's not even on this company." But she cooled off enough to enjoy the road trip with McKinney to Lowell and Baltierra's wedding.

Amber Portwood

Portwood also revealed her own new business venture - flipping houses with her fiancé Matt Baier. Together, they put down $18,000 on their first house and Portwood explained that she hoped to renovate the property and turn it into a sober-living home for recovering addicts. She admitted that the purchase is a big risk.

"The money that I've made, I wanna be smart with it now. Because back in the day, I completely blew all of my money, and I didn't even know what I was doing," Portwood said, before leaving to Baltierra and Lowell's wedding with Baier.

Farrah Abraham

While she didn't receive an invitation to Lowell and Baltierra's wedding, Abraham also prepared for a trip, this time to the UK to film "Celebrity Big Brother" in London. Abraham initially asked her mother Debra to look after her daughter Sophia for her while she was away for one month, but she changed her mind when she deemed her mother unfit to care for Sophia. When Abraham told Debra that she would no longer be watching Sophia and Abraham's father would take care of Sophia instead, an argument ensued after a family dinner and Abraham brought her mother to tears again before collecting her daughter and leaving. As they left, Debra asked her granddaughter for a kiss goodbye and the 6-year-old coldly said, "Nope."

Catelynn Lowell

Lowell and her longtime boyfriend Tyler Baltierra met in middle school and their relationship endured high school and the unplanned pregnancy of their first daughter Carly, whom they placed with adoptive parents Brandon and Teresa in a previous episode of "16 and Pregnant." After 10 years together, the 23-year-olds finally said "I do" in an emotional ceremony and Baltierra's vows to his wife were so sweet and heartfelt, it made their guests cry.

Another emotional moment happened during the reception, when little Carly got up to dance with her birth father, Baltierra. Lowell joined in, dancing alongside them while holding their second daughter Nova and Carly's adoptive mother Teresa danced with them as well. Baltierra held Carly in his arms as they danced and he told Teresa, "This is the best day ever in my life."

Watch Baltierra read his vows to Lowell in a clip from the episode below.