State of the Union speech: Amid denial by Stormy Daniels, Melania Trump appears alongside husband

First Lady Melania Trump made a very visible return to the public stage today by attending her husband's maiden State of the Union address, her first official appearance since accusations of infidelity surfaced about the president.

The enigmatic wife of Donald Trump emerged publicly for the first time since she fed the Washington rumour mill by cancelling her trip to Davos, Switzerland, leaving her husband to attend last week's World Economic Forum on his own.

Melania's no-show in Davos came on the heels of a bombshell report that Trump had a fling with porn star Stormy Daniels in 2006, just months after his wife gave birth to their son.

But for Trump's big night in Congress, Melania arrived smiling and waving, to warm and extended applause -- dressed in a crisp cream white pantsuit that stood in contrast to the black donned by Democratic lawmakers in solidarity with the victims of sexual harassment.

Minutes later, her husband took the floor and exchanged waves with his wife.

Watch the #SOTU live alongside tweets from key Trump Administration accounts here: https://t.co/Njo52YOlc2

— The White House (@WhiteHouse) January 31, 2018

Among Trumps' guests in the first lady's box were a US Marine corporal who stepped on an explosive device and lost both legs while deployed in Iraq in 2007; first responders who helped save hurricane victims in Louisiana and Texas, and parents of children killed by the gang MS-13.

Breaking with tradition, the first couple arrived separately to the Capitol, because, according to the first lady's spokesperson Stephanie Grisham, she was accompanying guests.

Afterwards, the first lady was seen being escorted out of the gallery by a military officer, as Trump spoke with lawmakers and administration officials on the House floor.

Tonight, President Trump delivered his first #SOTU address. He outlined the record-setting accomplishments of his first year and cast an inspiring vision for building a safe, strong, and proud America. https://t.co/Tc8uwgjI9b

— The White House (@WhiteHouse) January 31, 2018

It was not immediately clear whether the Trumps returned together to the White House.

As the 47-year-old wife of a 71-year-old man known for past lewd remarks about women, and whose two past divorces became public spectacles, Melania Trump is dogged by speculation that they lead largely separate lives.

Speculation flared anew when The Wall Street Journal reported on January 12 that Trump had paid Daniels $130,000, one month before the November 2016 election, to keep their adulterous liaison quiet.

The porn star was questioned anew about the reports as a guest given star billing Tuesday on late night ABC talk show "Jimmy Kimmel Live!"

But Daniels, reportedly bound by the non-disclosure agreement about the alleged fling, revealed little -- laughing awkwardly, flashing tight-lipped smiles and deflecting Kimmel's questions at every chance.

"I thought this was a talk show, not a horror movie," she said as Kimmel read from the transcript of a 2011 In Touch magazine interview, only recently published and reportedly about the liaison