Amber Portwood isn't happy with Gary Shirley, the father of her nine-year-old daughter Leah. According to a new report, the "Teen Mom OG" star recently took to her Twitter page and reacted to a few fans who had called her out for allegedly being behind on her child support payments to Shirley and quickly revealed that what fans are seeing on the show may not be true to their lives.

"I'm not behind at all," Amber Portwood explained to her critics, noting that the issue was also covered during the sixth season of the show last year. According to Portwood, she pays her former boyfriend, Gary Shirley, lump sums in child support for their daughter because Shirley has full custody of the child [VIDEO] and cares for her full-time.

While the ex-couple previously shared time with the child, Portwood chose to sign over her rights to Leah before entering prison in 2012 on a probation violation stemming from an assault charge years prior.

"Not that it's any of your business but [Gary Shirley] gets paid [$10,000] every time, not monthly," Amber Portwood continued. As she explained [VIDEO], the issue has reportedly been covered on "Teen Mom OG" for the past several years.

Is Gary Shirley trying to make Amber Portwood 'look bad' on 'Teen Mom OG'?

As her Twitter rant about child support continued, Amber Portwood took aim at her former partner, claiming Gary Shirley will "do anything to make [her] look bad." As fans may have noticed on Twitter, Portwood has been fighting back against Shirley's claims on Twitter for the past couple of months and slammed Shirley and his wife, Kristina Anderson, for "talking s***" about her weeks ago.

Amber Portwood is expecting her second child

After meeting Andrew Glennon in Los Angeles last summer while in production on a WEtv series that begins airing next month, Amber Portwood moved in with Glennon and quickly became pregnant. Last month, during a scene from the seventh season of "Teen Mom OG," Portwood was seen taking a pregnancy test while on vacation in Hawaii with her boyfriend. A short time later, she shared the news with her family.

To see more of Amber Portwood, Gary Shirley, and their co-stars, including her boyfriend Andrew Glennon, Shirley's wife Kristina Anderson, Taylor McKinney, Catelynn Lowell, Tyler Baltierra, Farrah Abraham, Maci Bookout, Mackenzie Edwards, and Ryan Edwards, tune in to new airings of "Teen Mom OG" on Monday nights on MTV at 9 p.m.