Kelly and Sharon Osbourne party with Kate Moss at 'summer clown' bash to mark a first anniversary since Ozzy's death

Kelly and partied with at a 'summer clown' bash to mark first anniversary since Ozzy's death.

Black Sabbath frontman Ozzy died in July last year aged 76, just two weeks after performing a farewell concert in his hometown of .

On Saturday, it marked Sharon's first wedding anniversary since Ozzy's passing.

Sharon and Ozzy got married in a ceremony in 1982 in Maui, . It would have been their 44th wedding anniversary.

Taking to Instagram on Sunday, Kelly shared sweet snaps of her and Sharon attending Evgeny Lebedev's summer clown-themed party from the night before.

For the occasion, Kelly looked incredible in a black bodycon dress, while Sharon stunned in a white jacket and pink maxi skirt.

The pair were seen beaming for snaps as they partied the night away with model Kate. 

Alongside the snaps, Kelly penned: 'I don’t even know where to begin in thanking @mrevgenylebedev for throwing such an incredible summer clown themed party! 

'First of all I love a good themed event but secondly it was so amazing to be around such special friends that made my mum laugh so much. 

'It was the perfect night and made what could have been such a hard day for my mum one we will both never forget. 

'I don’t think we have laughed like that in quite some time. Forever grateful!'

It comes after Kelly wrote a moving letter to her mother Sharon to mark the anniversary. 

Kelly paid a visit to Ozzy's grave and lay a huge bunch of flowers. 

The Prince of Darkness was buried close to the lake at the heart of the sprawling 250-acre private family estate in Buckinghamshire. 

She wrote on Instagram: 'My Dearest Mummy,

'Today feels different. A day that was once filled with celebration now carries a quiet ache. This is your first wedding anniversary without Daddy by your side, and I can only imagine how heavy your heart must feel. There are some dates that remind us just how deeply we have loved and today is one of them.

'I hope you know that love like yours doesn't end when a life does. It changes shape. It becomes the warmth of the sun on your face when you need comfort, the memories that make you smile through tears, the quiet moments when you somehow know he's near. Daddy may no longer walk beside you, but he will never stop walking with you.

'I often find myself imagining him looking down on you with that magical smile. The one that held so much pride and so much love. I know he would want you to see yourself through his eyes: resilient, compassionate, courageous and endlessly loving.' 

Kelly went on to praise Sharon's strength and resilience after Ozzy's death and thanked her mother for being a wonderful grandmother to her son, Sidney, three. 

She wrote: 'Every day since he left, you've had to learn how to carry both grief and hope in the same heart and somehow, you've continued to do it with extraordinary grace.

'He would be so incredibly proud of the woman you are becoming. Not because you've forgotten him but because you've found a way to keep living while carrying him with you. That takes a strength few people ever truly understand.

'Please remember that although today reminds us of what has changed, it can never take away what you and Daddy built together. A lifetime of love cannot be erased by death. It lives on in every story we tell, every lesson he taught us, every laugh we still hear in our memories and in that family that continues to grow because of the love you both created.

'Sidney and I love you more than words could ever hold. He may not fully understand today, but he already knows what it feels like to be wrapped in your love, and one day he will know just how lucky he is to have a Nana whose heart has loved so deeply.'

Kelly said as the family experience every milestone since Ozzy's death, they will support each other through their grief.  

'As you walk through every first, every anniversary, every birthday, every Christmas and every milestone that now feels different without Daddy, please never forget that you do not walk them alone. We are here. We will hold your hand when the days feel too heavy, celebrate your victories, sit with you in your sadness and remind you whenever you need reminding that love is still all around you,' she wrote.

'Daddy's greatest legacy wasn't simply the life he lived. It was the love he gave, the family he helped create and the remarkable woman he adored. That woman is you.

'So today, alongside the tears, I hope you can also feel the gentleness of his love surrounding you. I hope you can hear him whispering that he's still so proud of you, still cheering you on, still loving you with all that he has.

'And while we miss him beyond measure, we will never stop making sure you know how deeply you are loved, too.

'Happy Anniversary to a love story that even heaven could never end.

'With all my love, and all of baby Sidney's too.'

Fans wrote: 'This is so beautiful' and 'Such a poignant, loving letter to your Mum - She’s so lucky to have such a beautiful daughter n family during this difficult point in her life'. 

Sharon also shared a photo of her hand holding Ozzy's hand along with the words: 'Today would have been our 46th wedding anniversary. Instead, it is a celebration of a love that even death could not diminish. I miss your hand in mine, but I carry your love with me every step of the way. Forever my husband. Forever my heart.' 

It's been a tough time for Kelly after Ozzy's death. She also ended her engagement to Slipknot DJ Sid Wilson in March.

Kelly previously explained that she had been so grief-stricken by the loss of her beloved father that she had been struggling to eat and was forced to hit back when trolls criticised her weight loss. 

In March, hit out at 'cruel trolls' who 'dehumanised her' following her appearance at the in Manchester.

Kelly attended the ceremony to collect a posthumous Lifetime Achievement for her father. 

But as well as celebrating Ozzy's life during the evening, Kelly also was seemingly subject to negative comments about her appearance. 

Speaking on the backlash, she said: 'There is a special kind of cruelty in harming someone who is clearly going through something.

'Kicking me while I'm down, doubting my pain, spreading my struggles as gossip, and turning your back when I need support and love most.

'None of it proves strength, it only reveals a profound absence of character. I'm currently going through the hardest time of my life. I should not even have to defend myself. But I won't sit here and allow myself to be dehumanised in such a way.'