"I just had my first shower in two months," Teigen began in a video. "I've been taking baths because I couldn't stand to be in the shower. I couldn't, like, physically stand in the shower."
"I feel really, really good," she continued, before thanking fans for their birthday wishes. "Thank you I feel very clear and very good."
"Also, you guys have no idea and I cannot wait to tell you someday," Teigen added. "I realize that just left you supremely hanging. I'm sorry. I just mean it's been a ride. It has been a journey and I'm happy to be back again."
Back in September, Teigen and Legend lost their third child -- who they had named Jack -- after Teigen suffered a placenta abruption.
The couple, who also share daughter Luna, 4, and son, Miles, 2, opened up about their tragic loss, sharing raw, emotional posts from the hospital at the time.
"We are shocked and in the kind of deep pain you only hear about, the kind of pain we’ve never felt before," wrote Teigen. "We were never able to stop the bleeding and give our baby the fluids he needed, despite bags and bags of blood transfusions. It just wasn’t enough."
"Jack worked so hard to be a part of our little family, and he will be, forever," she added. "We are so grateful for the life we have, for our wonderful babies Luna and Miles, for all the amazing things we've been able to experience. But everyday can't be full of sunshine. On this darkest of days, we will grieve, we will cry our eyes out. But we will hug and love each other harder and get through it."