The pair were one of 10 acts that were successful in last night's Eurovision semi-final inDüsseldorf.
They qualified alongside neighbours Georgia and Russia, but other neighbours Armenia and Turkey were not so lucky.
The winning acts were chosen by a combination of votes from viewers and votes from expert juries in each competing country.
“We would like to reassure the Azerbaijani people that we will perform even better in the final and urge them to continue to support us," Ell & Nikki, otherwise known as Eldar Gasimov and Nigar Jamal, told an APA correspondent.
They told a press conference after the show that it had been "a pleasure and an honour" to know those that hadn't made it to the final. "We wish them good luck and we will miss them, but the friendship continues," they said.
One fan commented at the press conference that Nikki looked nervous before going on stage tonight. She replied that "I was excited beforehand and my daughters were watching me and it was so important not to fail."
Ell & Nikki were drawn 19th in a lottery yesterday to decide the running order for Saturday's Eurovision final, which will also take place in Düsseldorf.
The successful countries last night were Azerbaijan, Serbia, Greece, Lithuania, Georgia, Switzerland, Hungary, Iceland, Russia and Finland. Turkey, Norway, Armenia, Portugal, Malta, Croatia, Albania and Poland were all sent packing. "The biggest shockers were arguably Iceland's inclusion and Norway's exclusion from the finals," CNN commented.
The US broadcaster noted an improvement in the quality of songs in the competition this year.
"Every year great songs rise above the din at the event, with several this year piquing interest - many are raving about a song from Azerbaijan,"CNN said.
France are the bookies' favourite with their entrant Amaury Vassili singing what Eurovision describe as an "opera bolero" number in Corsican.
Azerbaijan are up there too with most of the bookmakers placing them third or fourth with odds of 8/1 or 9/1 on victory.
Georgian group Eldrine are surprised to be through to the final. "All of us hoped to be in the final and it is an achievement, but I didn't think about it. It was a shock, and it is great," lead singer Sophio Toroshelidze told the post-performance press conference.
Asked about the tension between performing the type of song that could win Eurovision or a song that represents the culture of the country, Toroshelidze said: "Some represent their culture and it is very good, and I'm proud that our product is Georgian."