Rebekah Vardy, Kate Ferdinand and Dr Alex George were among the celebrities sharing positive messages on World Mental Health Day.
Actors, presenters and TV stars marked the international day for global mental health education, awareness and advocacy against social stigma.
The day was first celebrated in 1992 by the World Federation for Mental Health, a global organisation working in some 150 countries.
She told her 1.3 million Instagram followers: “Mental health is something I have struggled with for as far back as I can remember …. it can be a rocky journey, and one that we have to take with care, being kind to ourselves can be one of the hardest things to do.
“I just really wanted to say to everyone who is struggling you are not alone. Although we often feel alone and like no one understands, there are many avenues of help available, talking to someone can really lessen the pressure on your shoulders.
“Peoples lives may look a certain way from social media and everything can look perfect but this doesn’t mean they don’t have internal struggles. It’s ok to feel overwhelmed and unstable even when everything looks perfect from the outside.
“Sending you all lots of love and strength today and always.”
Sharing a photo of them together as well as a drawing, he wrote on Instagram: “Today is incredibly hard, there is no way round it. I was so proud having Llyr with me in A&E, the day this photo was taken was the last time we were together. Lockdown hit and I had a job to do in London.
“This drawing means the world to me, it took @emmartinillustrations_ 5 days to do by hand. Thank you so much. I am so grateful.
“World Mental Health day is a reminder for us all to hold our loved ones close, to reach out to those who might be struggling and, importantly, to look after ourselves.
“I have made a promise to Llyr that I will be relentless in my mission to bring change to mental health at schools. For you, my boy.”
Television presenter Flack, who won the 2014 series of the BBC One dancing competition, killed herself in February.
Manrara wrote: “Today is #WorldMentalHealthDay…. Let’s always remember that sometimes those that seem the strongest, can sometimes be fighting the toughest battles.
“The simplest choice for us all to make is to #BeKind. For anyone suffering, remember that you are never alone; this too shall pass…”
Former Love Island contestant Malin Andersson shared a quote on Twitter.
It said: “When you get into a tight place and everything goes against you, till it seems as though you could not hang on a minute longer, never give up then, for that is just the place and time the tide will turn.”