Rob Kardashian Posts Sweet Tribute to Blac Chyna

— -- Rob Kardashian was singing his fiancée Blac Chyna's praises ahead of the season finale of their reality show "Rob & Chyna."

"What a great year," he wrote on Instagram. "I'm so Blessed [sic] to have met the best Mama in the world Chyna and I got my baby girl about to be here."

"Thank you God for doing what you do," the 28-year-old reality star continued. "Thank you to all who supported us."

The couple, who are expecting their first child, have encountered some bumps in their relationship, but as Sunday's season finale showed, they've been able to work through them.

The final episode opened with Chyna, 29, still upset after the couple's explosive fight and Kardashian's subsequent disappearance. "I don’t even know if I want to stay with Rob. I don’t know if I want to do this no more with him," she confided to a friend.

Chyna then turned to Kardashian's older sister Kim Kardashian West for advice. "You’re a man, you have a kid on the way, man up," Kardashian West told her brother, after arranging a sit-down with the three of them. "If Kanye [West] did that to me and like disappeared for days..."

At the urging of Scott Disick, sister Kourtney Kardashian's ex, Kardashian went to see a therapist and opened up about his issues with Chyna, particularly how quickly their relationship has progressed and their difficulties with communication.

The therapy session brought the pair closer together, but there was still one thing Chyna wanted from her fiancé.

Chyna asked Kardashian to take a paternity test "to shut down people and just to make you feel more secure."

Surprisingly, Kardashian agreed and the episode concluded with the test results showing that Kardashian is indeed the father.

Not all the focus this weekend was on Kardashian's and Chyna's baby, however. Her son King Cairo, whose dad is the rapper Tyga, celebrated his fourth birthday this weekend with two Ferrari-themed parties, given by each of his parents.

In a sweet message to Chyna's son, Kardashian wrote on Instagram, "THANK YOU for letting me see what a great Mama you got! That was the first thing I fell in love with, the way she Loves FOR You is something I can't wait for! Can't wait for the bond I'm going to have with my daughter so Thank You King for allowing me to see that!"