The actress attended the Golden Globes at the Beverly Hilton on Sunday and was beyond ecstatic when she found out she won the first award of the night -- Best Performance by an Actress in a Supporting Role in a Motion Picture for her role in Steve Jobs.
"I just have to kiss them. Sorry," Winslet, 40, said during her acceptance speech. "I really am actually extremely surprised and overwhelmed. Sorry. Just take a minute. Thank you so much to the Hollywood Foreign Press."
"Is this really happening? This is really happening. OK," she continued. "I just want to start by saying what an incredible year for women in film and I mean, these categories, they're so crowded and crowned with incredible skill and integrity, and I feel prouder than ever this year to be included. I really, truly do. OK."
ET caught up with Winslet in the press room, where she still was on cloud nine over the "shocking" victory.
"I'm an old lady... and moments like this one, they never get dull, they never get any less nerve-racking," she revealed. "These moments mean a great deal and to still be so fulfilled I feel incredibly blessed."
"Who would you choose to party with tonight to guarantee that you would get out of control?" ET asked.
"I'm actually going to let you in on a little secret, which is obviously no longer about to be a secret anymore," Winslet said, laughing. "I have this recurring neck problem and I realized as I was about to leave the hotel to come to the red carpet, I realized that it had been hurting quite a lot all day."
"So I went ahead and booked a massage for tonight at 9 p.m., which I think I'm going to have to cancel," she continued. "I suppose I'll go out partying, I'm sure my husband will drag me out on the town."
ET also caught up with Winslet's Titanic co-star, Leonardo DiCaprio, who was just as elated over her win.
"She's my favorite actress in the industry," he shared. "She's actually hanging out with me tonight. We're gonna go to the after-parties together."