"Today is the day! We finally get to find out if we will have a son or a daughter #Anticipation #IsKillingMe," Baltierra wrote alongside a photo of the party featuring blue and pink decorations.
Lowell and Baltierra found out they're expecting their second child back in May. However, Lowell just confirmed her pregnancy earlier this month by writing on Instagram, "#it'sofficial #4months @tylerbaltierramtv." Lowell had posted a black and white photo of her growing baby bump.
In prior tweets, Lowell has expressed how she and her longtime boyfriend are ready for a baby after giving their first daughter, Carly, up for adoption in May 2009 when they were both 16-years-old. Baltierra has also tweeted about how he thinks of Carly often.
Lowell confirmed Teen Mom's revival on Twitter last week, and the new season is slated to premiere in early 2015. Farrah Abraham, however, won't be included in the cast.
"@AmberLPortwood @MaciBookoutMTV @TylerBaltierra looking forward to showing you what we have been doing!," Lowell wrote.
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