Beyonce and Jay-Z, known to have always kept their relationship private, gave fans a treat when they displayed some PDA on stage at the Sound of Change concert in London Saturday night.

The 31-year-old singer, who is rumored to be expecting her second child appeared on the stage in a sexy leather one suit to perform a medley of songs including, Grown Woman, At Last and more. When she performed Crazy in Love, Jay-Z entered in an all-black ensemble and rapped his verse. Towards the end of his part of the song, he gently gave Beyonce a kiss on her cheek.

The singer smiled as he exited the stage.

According to The Daily Mail, sources said the PDA showed between the couple electrified the crowd.

"He came on and the crowd went absolutely crazy. No-one was expecting it. He gave her a big kiss on the cheek as he walked on stage," the source said.

"They looked more in love than ever and so proud of each other. He was utterly besotted with her."

Beyonce appeared to put the pregnancy rumors to rest on Saturday, as there was no baby bump in sight.

E! News first reported on May 17 that the singer was expecting a child.

While Beyonce never responded to the pregnancy speculation, Jay-Z reportedly shut down the rumors, Hot 97 reported.

Hot 97 Program Director Ebro Darden, also known as "Ebro" said on the radio's morning show that he emailed the rapper on to give his congratulations on the baby news, when the rapper emailed him back and told him that the rumors weren't true.

I emailed on some congratulations, send my love to the family, blah, blah, blah," Ebro said.

Ebro noted that Jay-Z responded with a brief email.

"It's not true. The news is worse than blogs," the rapper allegedly said in an email.

Enstars reported earlier that Beyonce was spotted drinking champagne while shopping in Berlin.

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Beyonce, Jay-Z