Jennifer Lopez sets the stage on fire with eye-catching performance, extremely seductive dancing.

The singer put on a free show for 1,500 fans on Thursday as a warm-up to her Dance Again world tour, which officially kicked off in the city on Friday night. Hot! Jennifer Lopez resumed her Dance Again world tour in Lisbon, Portugal to a huge crowd at the  Pavilhao Atlantico on Friday night.

The singer lit the city on fire on Thursday in a series of racy costumes after putting on a free show after letting a select group of ticket-holders into her rehearsal.And on Friday, doors opened at the  Pavilhao Atlantico to a 20,000-strong crowd.

Taking the stage in a nude bodysuit emblazoned with red flames, she reigned over the arena with a high-energy performance.

She’s got back-up: Two muscled men flanked the singer

Fans at the show, which was also attended by her four-year-old twins, Max and Emme, cheered wildly when JLo waved a Portuguese scarf.

Both performances saw Jennifer going through her biggest hits and a variety of eye-catching costumes that showed off her toned abs and famous derriere.

After the grueling set, JLo trekked to Germany, where she performed on the country’s hit show Wetten Dass, tantalizing fans in a racy black lace number on Saturday.

The Jenny from the Block hitmaker began her Dance Again World Tour on June 14 in Panama City, travelling across Latin America before kicking off her co-headlining tour with Enrique Iglesias throughout North America on July 14.

Highly-styled: The singer’s back-up dancers matched her blue sequined ensemble with sparking pants of their own She’s got the moves: The singer danced to the rhythms in the fringed number.

Lighting up the night: JLo also performed a free concert in Lisbon on Thursday, letting 1,500 fans into her rehearsal

Meanwhile, rumours are swirling about the status of the singer’s relationship with toyboy Casper Smart – her backup dancer and newly-anointed head choreographer of the tour.

Earlier this week, Jennifer was spotted rocking some serious bling on her ring finger, prompting speculation Casper may have asked the singer to marry him.

Jennifer was in France for Paris Fashion Week with Casper and her daughter Emme when she stepped out with the sparkler.

However, neither party has addressed the claims.

New Look: The 43-year-old singer on Saturday performed on a German TV show and changed costumes multiple times for the show Wetten dass..?

Just a few weeks prior to their ABC News interview, rumors spread online that Lopez and Smart had gotten engaged, but JLO quickly put the rumors to rest via her website.

‘Rumors!!! Don’t be fooled by the rocks that I got,’ Lopez wrote, using a reference of her 2002 popular song Jenny from the Block.