Coldplay frontman Chris Martin was wary after noticing a pair of concertgoers at his Friday, August 22, concert wanted his help to get engaged following the now-viral Astronomer scandal. During the concert held at London's Wembley Stadium, a camera panned to a man holding up a sign that read, "I want to propose to her," with an arrow pointing at his girlfriend. "Now, listen, my brother," Martin, 48, said, per social media footage.