Mark Wahlberg and Natalie Portman are just two big Hollywood stars bringing the heat this winter in their swimsuits. Portman hit the beach while on vacation, and Wahlberg did a cold plunge.

Portman, 43, rocked a super chic black embroidered mini dress that was an instant head-turner. She paired it with some equally stylish matching strappy heels, giving her that extra bit of red ...