“Looks like we are starting off 2018 with another big milestone… Sooo happy to announce that Maddie is FINALLY going to be a big sister,” she wrote.
"2017 was filled with some of the biggest challenges of my life, as well as some of the biggest blessings, so I made a choice to lay low this year to focus on truly becoming my best self as a person and as an artist.”
Her sister Britney was one of the first to congratulate her on the impending arrival.
The 26-year-old shares 9-year-old Maddie with her ex-fiancé, Casey Aldridge.
This article originally appeared on marie claire.