Prince Harry and Prince William led a gathering of celebrities with over 300 radio stations this morning for #MentalHealthMinute, a 60-second message to the world to let everyone know that 'whoever you are, however you're feeling and whatever you're going through, it's okay to say'.
Lady Gaga, Dame Judi Dench, Dame Jessica Ennis-Hill and David Harewood also featured in the broadcast.
As part of the global Mental Health Week, the stars came together at 10.59am in a historic first with radio stations from across the UK, including BBC Radio 1, Radio 2, Five Live, smaller local stations and ones run by Global, Bauer and Wireless.
"Right now for the very first time, radio stations all over the UK are coming together to broadcast the same thing at the same time. Hundreds of stations, millions of listeners," says actor David Harewood.
Dame Judi Dench continues: "Because, no matter who you are, or what station you listen to - news or new wave, politics or punk, Gershwin or Lady Gaga..."
Lady Gaga jumps in: "All of us have moments when life is tough, and sometimes you just need someone to talk to. Because taking care of your mental health is important for everyone.
"Whether you listen to songs by Prince on the radio to get out of your head, or you're an actual prince on the radio..."
That's the cue for Princes William and Harry, who say: "Just starting a conversation on mental health could make all the difference.
"When you talk about something You have less reason to fear it.
"If you do have the courage to speak about it, you really can make things better."
Athlete Jessica Ennis-Hill continues: "This simple message can make a big difference.
"That's why radio is coming together today to talk about mental health."
Dame Judi Dench then wraps things up by saying: "How are you feeling today? It's okay to say."
Heads Together also brought together The Royal Foundation and eight mental health charities for the project, including the Anna Freud Centre For Children and Families, Best Beginnings, CALM, Contact, Place 2 Be, Mind, The Mix, and Young Minds.
'U OK M8?' is an initiative from LADbible in partnership with a range of mental health charities which features a series of films and stories to raise awareness of mental health.
Explore more here and don't suffer in silence. Reach out. It's the brave thing to do.
MIND: 0300 123 3393.
Samaritans: 116 123.
CALM: Outside London 0808 802 5858, inside London 0800 58 58 58.