Amber Portwood may be busy preparing for the upcoming birth of her second child but over the weekend, the "Teen Mom OG" star took some time out to honor her oldest child's birthday on Instagram. As fans may have seen, Portwood shared a throwback photo of her daughter Leah Shirley with her many fans and followers and revealed that the child was celebrating her ninth birthday.

"This little beauty is 9 years old today!" Portwood wrote in the caption of a baby photo of her daughter. "I am so proud of you [Leah Shirley]! You will always be my booboo.

Happy Birthday baby." Portwood shares her nine-year-old daughter with her former fiancé, Gary Shirley, who also has a younger daughter with wife Kristina Anderson.

Amber Portwood and Gary Shirley first gained fame when they starred alongside one another on MTV's "16 & Pregnant" before moving on to "Teen Mom" and "Teen Mom OG."

Amber Portwood is two months pregnant

Amber Portwood is currently expecting a child with boyfriend Andrew Glennon, who she started dating just months ago after meeting on the set of "Marriage Boot Camp: Reality Stars Family Edition." During the show, Portwood tried to work things out with ex-fiance Matt Baier but was unable. So, once filming wrapped, she and Glennon began spending time together in Los Angeles, where he resides, and also in Indiana, where she lives.

Portwood and Andrew Glennon confirmed they were dating on Instagram on August 17 and attended the MTV Video Music Awards days later. Then, ahead of the seventh season of "Teen Mom OG," which shows the end of Portwood's relationship with Matt Baier, Portwood confirmed they were having a baby.

Amber Portwood and her boyfriend enjoyed a Hawaiian vacation last month

Since the start of their relationship, Amber Portwood and her leading man have done a lot of traveling and in mid-October, weeks before confirming the reality star is expecting, the couple traveled to Hawaii for a short vacation. During their trip, Portwood and boyfriend Andrew Glennon shared a number of images with their fans and followers, including a cute selfie which featured Portwood in oversized sunglasses.

For more of Amber Portwood, her family, her boyfriend, Andrew Glennon, and their co-stars, including Farrah Abraham, Maci Bookout, Ryan Edwards, Taylor McKinney, Catelynn Lowell, and Tyler Baltierra, tune into "Teen Mom OG" season seven, which premieres on November 27 at 9 p.m. on MTV.