In addition to emphasizing that split households should focus on making the kids feel safe and loved, she added, "Being a step parent requires (among other things) selflessness, empathy, loyalty, honesty, an open heart and patience. If these are not qualities you consider yourself to have or be able to develop, than [sic] you should ask yourself if you deserve to be in their lives. Because they deserve the absolute best."

Hours after Sharna called out MGK for his strongly-worded message to Brian, the rapper -- whose relationship with Megan ended in December, just one month after Megan revealed her pregnancy -- announced that the actress had given birth.

"She's finally here!!" he wrote on Instagram alongside a clip of himself holding his daughter's hand. "Our little celestial seed."

He also noted that Travis Barker played a part in welcoming his and Megan's baby by helping create music for the day, adding, "We composed the score of the birth. What an epic journey. Praise God."

Read on for a look back at MGK and Megan's road to parenthood together.