Celebrity Lindsay Lohan Poses in Her Underwear and Jokes About Untreatable Illness The Life Travelers actress makes light of her current health situation on Instagram By People Staff Published on January 24, 2015 07:35 PM Share Tweet Pin Email Photo: PA PHOTOS/LANDOV When life gives you lemons, take an Instagram. That’s what Lindsay Lohan has done in the wake of contracting chikungunya, a mosquito-transmitted virus causes fever and severe joint pain and is currently untreatable, while vacationing in Bora Bora. Despite the untreatable illness, Lohan, 28, posted a sexy selfie of herself on Saturday, showing off a super slim figure in a skin-tight top and a Calvin Klein thong. “#mycalvins are helping me fight off my chikungunya,” she captioned the picture, adding, “hehe.” Though she’s able to laugh about the situation, friends say she’s not always feeling her best. Her joint pains “come and go,” a friend tells PEOPLE. Adding to the actress’s list of things to worry about: ongoing legal issues. On Wednesday, Lohan is due in court, where she could potentially face jail time for not having completed community service hours she was sentenced to after her 2012 reckless driving case.