Prince William performed an impromptu rendition of Living On A Prayer with Jon Bon Jovi and pop star Taylor Swift.
US songwriter Taylor Swift gets two mentions in the new book of Guinness World Records along with one Direction, Psy and Doctor Who.
Robbie Williams headlined the Capital FM Summertime Ball at Wembley Stadium on Sunday, and he was joined by acts including Taylor Swift.
Prince William enjoyed the company of stars Jon Bon Jovi and Taylor Swift during a charity gala in Kensington Palace.
The trio were the main attractions at the Winter Whites Gala in Kensington Palace to support homeless charity Centrepoint.
William met Bon Jovi and Swift at the State Apartments before hitting the red carpet.
Other guests included Benedict Cumberbatch, James Blunt and Tinie Tempah.
The Duke of Cambridge stopped to acknowledge one of the men who was helping to create fake snow as the guests arrived.
Gerry Glynn, who was blowing the soap and water mix over guests, said he was shocked the prince stopped to speak to him.
"He was very impressed with the snow," Mr Glynn laughed.
US superstar Taylor Swift is the latest addition to the list of acts due to perform at the BRIT Awards on February 20th.
Swift, 23, earned an estimated $57m (£36m) in 2012 and has sold 26 million albums worldwide.
She'll come face to face with former love interest Harry Styles, whose band One Direction are also on the bill for the ceremony.
Robbie Williams, Muse, Ben Howard, Mumford & Sons, Emeli Sande and Justin Timberlake will also perform at the event, which is to be broadcast live on ITV.
According to reports One Direction's Harry Styles and US country music singer Taylor Swift have split following a bust-up in the Caribbean.
The stars, who have been together since November, were spending time together on the island of Virgin Gorda, where they were seen happily posing for pictures with fans.
But the romantic holiday is reported to have lasted only a few days, before Swift caught the first flight back home to the US after a row with the teen heartthrob.
She suggested that all might not be well in her relationship with Styles when she posted the lyric "'Til you put me down", a line from her song I Knew You Were Trouble, on Twitter on Sunday.
She and Styles had spent Christmas apart before the One Direction singer flew out to the US to spend New Years with Swift.
They enjoyed New Year's Eve together in New York, where Swift was performing, and were pictured kissing in Times Square.
A spokesman for Styles would not comment on the reports of split.
Chart-topping American singer Taylor Swift switched on the Christmas lights at Westfield London on Tuesday.
Afterwards she spoke to ITV News and revealed the worst Christmas present she has received.
The singer also showcased her 'English accent'.
Taylor Swift was crowned entertainer of the year at the Academy of Country Music Awards on Sunday.
22-year-old singer said: "I am so amazed that the fans keep doing such incredibly nice things for me. I just want to hug them all the time and thank them for everything - it really blows my mind."