She’s only 24 years old, but Kristin Cavallari definitely thinks about the future … of her face. “No one’s ever told me I needed to get a facelift or anything,” she said. “Never say never, but I don’t think I’ll ever get Botox because we don’t know the long-term side effects, and I just don’t think that can be good for you.” In fact, the starlet has yet to cosmetically alter herself at all… teeth excluded. “The most I’ve done is Crest Whitestrips,” she jokes. Cavallari, a practicing vegan (“Realistically it happens 50 percent of the time,” she says) who hits the gym at least four times a week, says she “craves” healthy food. “If I don’t eat healthy food I don’t feel good,” she shares.The starlet admits that her workouts, combined with a light diet and intense Dancing with the Stars training, did once take their toll. “At one point I got too skinny and my manager had to say something to me,” she reveals. But with DWTS behind her and a trainer helping her with cardio and weightlifting three times per week, she’s on a healthier track.