The brunette only recently confirmed that her on-screen romance has spilled over off-set too and is happier than she's ever been.
"I don't even remember a time when he wasn't my boyfriend," Lea told the upcoming issue of Marie Claire.
"No one knows me better than Cory. No one knows what it's been like to go through this more than he does.
"Feeling like you have that net underneath you allows you to jump higher and go farther. He makes me feel like I can do anything. For the first time in my life, I feel really, really settled and happy. I feel like the luckiest girl in the world."
Lea also addressed feud rumors between herself and guest-star Kate Hudson from when she appeared on the show earlier this year and how gracious the Almost Famous actress was.
"I just heard about that, and it f***ing sucks," Lea recalled Kate telling her. "I want you to know that I think you're amazing."
Lea added that Kate went "straight to the top of my list because it was so classy of her to take a minute to [address the rumor], even though we both knew it was the biggest piece of crap in the world."
"I told her 'I love you, and I adore you. Thank you so much for creating a human moment with me.'"
Great to see our starlets are playing nice!