Halsey and Logic co-headline Summerfest's American Family Insurance Amphitheater June 29

It's been a long wait for Summerfest fans who typically get each year's first amphitheater announcements at least eight months in advance, but on Monday Big Gig officials finally revealed a headliner playing the 2018 edition.

Make that two headliners.

Pop star Halsey and rapper Logic will co-headline Summerfest's American Family Insurance Amphitheater on June 29.

Less than three years ago, Halsey was a little-known artist opening an arena tour for Imagine Dragons, including at the BMO Harris Bradley Center. But in 2017, she was the third-most streamed female artist, according to Billboard. She was one of the vocalists on the Chainsmokers' inescapable 2016 hit "Closer," and currently has a song on the top 10 of the Billboard Hot 100, "Bad at Love," from last year's sophomore album "Hopeless Fountain Kingdom."

Halsey — slated to be the musical guest on "Saturday Night Live" this weekend — was also on the Journal Sentinel's list of 11 predictions for Summerfest 2018 headliners.

RELATED: 11 Summerfest headliner predictions for 2018

Logic's appearance is good news for any ticketholders to his scheduled Dec. 13 show at the Rave's Eagles Ballroom, which was canceled due to illness.

His anti-suicide anthem "1-800-273-8255," from his Billboard 200-topping 2017 album "Everybody," went triple-platinum in the U.S. and is nominated for Song of the Year at the 60th Annual Grammy Awards, airing Jan. 28.

An opening act has yet to be announced.

Tickets, priced between $60.07 to $109.40, go on sale at noon Jan. 19 at the Summerfest box office (200 N. Harbor Drive); Ticketmaster retail outlets; select Walmart stores in the Milwaukee area; by calling (800) 745-3000 or (866) 448-7849; or visiting ticketmaster.com. Tickets include admission to the other Summerfest stages June 29.

Summerfest runs June 27 to July 1, and July 3 to 8. Eight of the 11 amphitheater shows have been booked, Summerfest's Vice President of Entertainment Bob Babisch revealed at a board meeting last month for parent company Milwaukee World Festival Inc.

RELATED: Summerfest and Uline extend sponsorship seven years and plan for new Uline Warehouse stage

A couple more Summerfest revelations appear to be imminent.

On Sunday evening, a "code" was posted on Summerfest's Facebook and Twitter pages.

Spoiler alert: The code reads: "Not one not two but three show announcements."

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