After being spotted courtside at a Lakers game, Zac Efron and Neighbors co-star Halston Sage are reportedly officially a couple, but who is Efron's newest leading lady?

“They are definitely an item. They were seeing each other a bit during filming of their movie together and ever since he went to rehab they got a lot closer. Her friends love him and say he is so sweet. He’s really good to her,” a source told E! News, confirming the relationship.

Who Is Halston Sage?

Sage, 20, considers herself to be a writer and held the title of editor at her high school newspaper. Aside from writing, she also participated in competitive horse riding for eight years. She also has a passion for books, music – she’s currently listening to country and Lorde – and 80’s movies: her favorite is About Last Night (1986) starring Rob Lowe and Demi Moore.

An avid dog lover, she has two dogs, one Golden Doodle and one Alaskan Klee Kai. The young actress is also close with her family – she is the oldest of three – and said that one of her favorite things to do during the summers is “Sunday night dinners on the beach with my family.”

Sage, who grew up out of the spotlight, was waiting for college acceptance letters when she found out How to Rock (2012) was picked up by Nickelodeon and she has been acting professionally ever since.

“Growing up in LA, you’re surrounded by this business and at the time, I was really frustrated because I knew that this [acting] was what I always wanted to do. It was really important to my parents that it was something I was passionate about, not something that I felt forced into. Once I turned 16, I just kept saying this is what I want to do. I’m going to pay for my own acting lessons, this is, you know, my dream. So I started taking classes outside of high school, I was still in regular high school and I met my agent when I was actually five, which is crazy…Finally when I was 16, I got to call him up and be like, “I’m ready to start auditioning!” And off I went,” Sage revealed to Just Jared.

After How to Rock ended after 21 episodes, Sage had small roles in The Bling Ring and Grown Ups 2, but her real breakout roles have yet to come. Currently, Sage is staring on her first network show, NBC’s Crisis, on which she plays Amber Fitch, a high school student who is taken hostage with the rest of her class. She can next be seen in this summer’s Neighbors and just finished shooting an indie thriller, Poker Night, staring Ron Perlman and Giancarlo Esposito.

Neighbors

No doubt, Neighbors will boost Sage’s career. The R-rated comedy stars Seth Rogen and Zac Efron as dueling neighbors. Sage plays Brooke, a sorority girl, the love interest for Efron’s character, Teddy.

“This was the first set I had ever been on that I was really surrounded by actors my age. It wasn’t either young kids or adults, so it was just like one big college party. The whole time. We would all just hang out at lunch. Zac, Dave [Franco], Chris [Mintz-Plasse], all of us, the girls, just hang out and be college kids,” Sage told Just Jared.

When asked to describe Efron in one word, Sage said, “Sweet.”

Efron and Sage in 'Neighbors'

Despite her relatively new status as a young Hollywood figure, Sage has been linked to a string of high profile beaus. In 2012, Sage dated Big Time Rush singer, James Maslow, and she was recently linked to Glee star Chord Overstreet.

Efron and Sage have not confirmed or denied their relationship. Neighbors hits theaters May 9.

Olivia Truffaut-Wong

More on Zac Efron and Halston Sage:

> Jessica Alba Mispronounces 'Zac Efron' At MTV Movie Awards; Rita Ora Rips Efron's Shirt Off

> Zac Efron & 'Neighbors' Costar Halston Sage Sit Courtside At Lakers Game

> Zac Efron Punched In The Face By Homeless Man On Skid Row

> Zac Efron, Michael B. Jordan & Miles Teller On 'That Awkward Moment' [EXCLUSIVE VIDEO]

> Zac Efron Thanks Fans After Trip To Peru Post Rehab

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