Jenelle Evans admits she's "exhausted" from her second pregnancy. Credit: Amory/AKM-GSI

This may be her second time at the rodeo, but that doesn't make it any easier! Teen Mom 2 star Jenelle Evans has just announced that she's pregnant with her second child, but the 21-year-old reality star is having a tough time thus far. 

“I’ve been exhausted this whole first trimester,” she told MTV. Evans has been struggling with "'round-the-clock" morning sickness, but she's still excited to expand her family with current boyfriend Nathan Griffith

The couple has been dating since this summer, and Evans told MTV that they started seriously discussing having a baby only a few months into their relationship. 

Evans had son Jace on season 2 of the MTV series 16 and Pregnant in August 2009. He is the son of Evans' ex-boyfriend Andrew Lewis

The reality star has had a series of relationships while on the spin-off show Teen Mom 2, including former boyfriend Kieffer Delp, ex-fiance Gary Head, and currently estranged husband Courtland Rogers.

Evans has been arrested almost 10 times in the last three years, often with her boyfriend, fiancé, or husband at the time. 

Her mother, Barbara Evans, currently has custody of 4-year-old Jace. Jenelle's boyfriend, Nathan Griffith, has a 2-year-old daughter named Emery from a  previous relationship. Emery is currently in the custody of his ex-wife's parents, and Evans' and Griffith's similar custody situations brought the couple closer. 

“He was like, ‘No one understands the situation I’m in and that I deal with,’ and I said that I could relate to him," Evans told MTV. "We both have to deal with our parents to deal with our children.”