United Kingdom, May 5 -- Lily Allen celebrated her 40th birthday "under some tricky circumstances".

The pop star reached the milestone on on May 2 and revealed she gathered her family and friends - including her 'Miss Me?' podcast co-host Miquita Oliver and fashion designers Kim Jones and Katie Hillier - for an intimate celebration over the weekend (03-04.May25).

Lily shared a picture of her birthday cake on Instagram and wrote: "Thank you to all my beauty friends and family who showed up for me and made my birthday a special one under some tricky circumstances. Love you all."

The singer's godmother Rose Boyt - daughter of artist Lucien Freud - also shared a post on Instagram about the party and paid tribute to the 'Smile' star.

Rose ...