Chris Martin could barely keep a straight face while performing an acoustic version of Coldplay’s “Viva La Vida” at a cancer benefit, but it wasn’t entirely his fault. It was Will Ferrell’s. 
 
 Martin and a slough of other stars were all performing at a one night charity event dubbed “Will Ferrell’s Best Night Of Your Life.” The show, produced by the comedy website and production company Funny Or Die, was a benefit for the charity organization, Cancer For College, which gives college scholarships to cancer survivors. The lineup for the 25th anniversary show featured some of the biggest names from music and comedy, including Jerry Seinfeld, Samantha Bee, Michelle Wolf, Pearl Jam’s Mike McCready, James Corden, Jimmy Kimmel, Guns N’ Roses’ Duff McKagan, Red Hot Chili Peppers drummer (and Will Ferrell lookalike) Chad Smith, and of course Martin and Ferrell. 
 
 As Martin was performing his acoustic set, Ferrell emerged onstage with a cowbell in hand. It was a nod to one of Ferrell’s most famous Saturday Night Live sketches where he he appeared as a cowbell ringer in a fake behind-the-music documentary about the story behind Blue Öyster Cult’s “The Reaper.” Apparently Ferrell had decided the Coldplay hit needed more cowbell and proceeded to join in Martin’s performance by ringing his bell and dancing across the stage. 
 
 As Ferrell pranced with his cowbell, Martin tried to keep a straight face, but can be seen desperately trying to stifle his own laughter. Martin apparently believes in the mantra that when you can’t beat ’em, you should join ’em and ended up facing off against Ferrell in an acoustic guitar-cowbell showdown. 
 
 Contact us at editors@time.com. ||||| Dakota Johnson is setting the record straight after rumors of a pregnancy swirled. 
 
 A rep for the 29-year-old actress tells PEOPLE Johnson is not pregnant after reports that pink and blue balloons were spotted above the home of her boyfriend, Coldplay frontman Chris Martin, on Sunday. 
 
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 According to her rep, Johnson was celebrating her birthday (which occurred on Oct. 4) at the rocker’s house. Guests spotted at the event included Johnson’s divorced parents, Melanie Griffith and Don Johnson, as well as Julia Roberts and Sean Penn. 
 
 The Bad Times at El Royale actress also recently celebrated her one year anniversary to Martin, 41. The two first sparked dating rumors after being spotted on a mid-October 2017 sushi date in Los Angeles and have steadily been getting serious ever since. 
 
 The two have even gone on some public dates this summer, including an outing with Aaron Paul and his wife Lauren. 
 
 Dakota Johnson Jim Spellman/WireImage 
 
 RELATED: Dakota Johnson Addresses Her Relationship with Chris Martin for the First Time: ‘I Am Very Happy’ 
 
 And in the latest cover story for Tatler, Johnson finally broke her silence about her musician love. 
 
 “I’m not going to talk about it, but I am very happy,” Johnson said. 
 
 A source recently told PEOPLE of the couple, “Chris lives in Malibu and Dakota seems to love hanging out there. They occasionally go for dinner with friends, but mostly have friends over at home. They go to the beach together, and walks around the neighborhood. They seem to enjoy sharing a quiet life. It does seem they are getting more serious.” 
 
 Martin was previously married to actress Gwyneth Paltrow for 10 years before splitting in 2014 and was linked to actress Annabelle Wallis in 2015. Paltrow and Martin share 14-year-old daughter Apple and 12-year-old son Moses. 
 
 Dakota previously had an off-on relationship with model/rocker Matthew Hitt.
– When a song needs more cowbell, Will Ferrell is there to deliver. At "Will Ferrell's Best Night of Your Life" Saturday, a charity event produced by Funny or Die to raise money for cancer survivors, Chris Martin was performing an acoustic version of Coldplay's "Viva La Vida" when he got some unexpected backing instrumentation, Time reports. Namely, Ferrell, who crashed the performance with his cowbell in a nod to one of his most famous Saturday Night Live sketches. See the video in our gallery. In other Martin news, despite recent rumors, he's apparently not expecting a baby with Dakota Johnson.