According to People's source, Barry and Garry invited "20 to 30 guests" to Manilow's Palm Springs house under the guise of a luncheon, which turned out to be a wedding ceremony. People says Manilow and Kief did not sign any paperwork but are wearing wedding bands.
Barry Manilow secretly married manager Garry Kief: Report
CHICAGO, IL - FEBRUARY 14: Barry Manilow performs on stage during the One Last Time Tour at United Center on February 14, 2015 in Chicago, Illinois. (Photo by Daniel Boczarski/Getty Images)
LAS VEGAS, NV - APRIL 01: President Stiletto Entertainmen Garry Kief, VP AEG Live Las Vegas John Nelson, VP/GM Paris Las Vegas Davide Hoenemeyer, Barry Manilow, VP of Finance Kevin Ortzman,VP Entertainment Scott Schecter celebrate the first anniversary of Barry Manilow's show at Paris Las Vegas on April 1, 2011 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LOS ANGELES, CA - OCTOBER 17: Garry Kief and Barry Manilow attend the wedding of Michael Feinstein and Terrence Flannery held at a private residence on October 17, 2008 in Los Angeles, California. (Photo by Jesse Grant/WireImage)
PALM SPRINGS, CA - FEBRUARY 08: Garry Kief President of Stiletto Entertainment and Terri Ketover 100 Women Award for 2014 Honoree attends the 20th Annual Steve Chase Humanitarian Awards Gala at Palm Springs Convention Center on February 8, 2014 in Palm Springs, California. (Photo by Gregg Felsen/WireImage)
January 1982: Popular American singer Barry Manilow in concert at the Royal Albert Hall, London. (Photo by Keystone/Getty Images)
Barry Manilow on 'The Tonight Show with Jay Leno' at the NBC Studios in Los Angeles, Ca. Tuesday, Jan. 29, 2002. Photo by Kevin Winter/Getty Images.
PHOENIX - NOVEMBER 12: Barry Manilow performs at America West Arena November 12, 2004 in Phoenix, Arizona. (Photo by Jeff Topping/Getty Images)
LAS VEGAS - DECEMBER 17: Singer Barry Manilow performs during his 100th 'Manilow: Music and Passion' show at the Las Vegas Hilton December 17, 2005 in Las Vegas, Nevada. Manilow's engagement at the Hilton has been extended into 2007. The singer will release the tribute album 'The Greatest Songs of the Fifties' on January 31, 2006, and was filmed this week for a PBS DVD and television special scheduled to air in March 2006. (Photo by Ethan Miller/Getty Images)
NEW YORK - JANUARY 31: Singer Barry Manilow performs onstage at the AmfAR's 10th Annual New York Gala at Cipriani 42nd Street on January 31, 2008 in New York City. (Photo by Bryan Bedder/Getty Images)
LOS ANGELES - NOVEMBER 4: Grammy-winning singer and legendary entertainer, Barry Manilow performs on 'The Talk,' Monday, December 15, 2014 on the CBS Television Network. (Photo by Lisette M. Azar/CBS via Getty Images)
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"It doesn't mean I'm retiring or anything. I'll do shows and I'll promote albums if I make any more, but no more big tours," Manilow told Billboard. "That's it. It's too much packing. It's 40 years -- more than that, really -- of packing and waiting for room service. People think it's glamorous, but glamorous is the last word I would use for this job. You don't see anything; you see the inside of your hotel room."
Billboard reached out to Manilow's rep to confirm the report.