And who can blame them?
The duo definitely brought their A-game to the Toyota Center Sunday evening with a doubleheader that included surprise appearances from a super pregnant radio personality and a well-known dancer (Hint: he's named after a famous ghost and he's really, really young).
Sign, sign, everywhere a sign . . . some even had lights on them.
The crowd was unbelievably into Enrique, whose finale of songs inspired enough cheering to nearly drown out the music on several occasions.
Iglesias kicked off his show with a the thumping club hit "Tonight (I'm Lovin' You)," which the singer slowly merged with the song's explicit cousin "Tonight (I'm Fuckin' You)" . . .
Enrique was all about working the Houston crowd, saying it was one of his favorite crowds in the world. He should know, considering he's played H-Town four times in the last 18 months.
What's not to love about Robin, the 21-year-old Enrique fan who joined the singer in a duet of Ben E. King's "Stand By Me"?
The good-natured guest was spotted in the front row holding a homemade sign and dragged on stage with Enrique and rest of the band, who were all sitting on stools for several easy-going songs. Shaking with nerves at first, Robin began to relax after a few shots of Atlantico Rum, a liquor Iglesias was unabashedly promoting.
The Latin Pop star told a story about his struggle to learn English when he moved to the United States as an 11-year-old. "Stand by Me" was one of the first songs he learned to sing at that time, and, as such, offered up an impassioned, heartfelt performance.
Learning to love the limelight, Robin took on his singing part head on, belting out lyrics like his name was on the concert bill.
Emerging from a trapdoor in the stage, JLo joined her dancers in a top-hat-and-cane number that had shades of Marilyn Monroe's "Diamonds are a Girls Best Friend" or Madonna's "Material Girl," depending on your preference of pop culture stars.
From the opening number, all eyes were searching from Casper Smart, J.Lo's dancer-turned-boyfriend in the wake of her split from Latin Pop icon Marc Anthony, who plays the Toyota Center this Saturday.
No where to be found on stage all night, Smart made an appearance during a brief video interlude and finally danced with Lopez in person during an encore performance of her newest single "Dance Again."
Have to admit, the guy has some serious moves and can pull off a mean back flip. Totally not let down.
As if the audience wasn't into her show-stopping performance already, JLo asked for a moment on behalf of the legendary Selena, whom Lopez played in a 1997 indie film about the life of the murdered Tejano star.
"Texas is very special to me because it was very special for her," J.Lo said about Selena, before taking on the singer's trademark song "No Me Queda Mas."
"She taught me so much about how to handle the spotlight with grace and love. She taught me that a smile can say more than even a thousand words."