Zac who?

High School Musical and Spring Breakers star Vanessa Hudgens, 24, and her boyfriend, The Carrie Diaries and Zoey 101 star Austin Butler, 21, headed out to Las Vegas this past weekend to celebrate a friend's birthday.

According to People, they spent Saturday night at Hakkasan and were spotted looking "very cute together" with lots of PDA. "They were seen dancing a lot throughout the night," a witness told People. "They were sipping on cocktails and being cuddly and affectionate and were spotted kissing non-stop throughout the evening. They were listening to the Bingo Players, who deejayed that night." One of the partygoers, Oliver Trevena, shared this photo outside a plane, writing, "& Were off to Vegas! Birthday crew - @VanessaHudgens @austinbutler @shawn_pyfrom @sophiedickens."

Back in March, Vanessa and Austin — who’ve been linked since 2011 — took in a burlesque show in New York City, where Vanessa temporarily relocated while Austin taped The Carrie Diaries. It’s good to see the dance-loving duo are still going strong!

Sources: People, @olivertrevena