They're back! After multiple hit collaborations, including "La Tortura" and "Te Lo Agradezco, Pero No," longtime friends Alejandro Sanz and Shakira have reunited again for "Bésame," a new collaboration featured on Sanz's new EP,

Shakira has used her Las Mujeres Ya No Lloran World Tour to showcase her career-spanning collaborations. Back on May 13, Shakira even treated the Bank Of America Stadium crowd in Charlotte, North to a surprise onstage reunion with Alejandro Sanz.

Shakira squeezed a stadium-level production into Little Caesars Arena on Thursday when her Las Mujeres Ya No Lloran World Tour dropped into the downtown arena. The tour is playing stadiums in most markets — Fenway Park in Boston, SoFi Stadium in Los Angeles — and Detroit is one of just a handful of cities where she's playing arenas.

Shakira made a special appearance on ' Starring Jimmy Fallon' this week, performing her beloved 1996 ballad “Antología."

“Antología” appeared on Shakira’s breakthrough album Pies Descalzos. The stripped down performance marks her second time reimagining an older song on The Tonight Show. Earlier this month, she and Wyclef Jean offered a lively rendition of her hit “Hips Don’t Lie.”

One of the new songs is “Monotonia,” a lilting bachata track with Puerto Rican star Ozuna, and he joined Shakira at MetLife. Ozuna wore a white sweater that said “I'm Blessed” and a big smile while on stage.

Since launching her Las Mujeres Ya No Lloran World Tour in Brazil earlier this year, Shakira has surprised attendees by inviting a number of fellow hitmakers to join her onstage. From Grupo Frontera, Carlos Vives and Maluma — all three joined her in Latin America — to Wyclef Jean, Alejandro Sanz, Ozuna and Rauw Alejando in the U.S. leg of the tour.

Someone who attended the recent Shakira concert in New Jersey may have been exposed to this wildly contagious disease.