Caitlyn Jenner has shared her excitement after becoming a grandparent for the 20th time as her son Burton and his partner Valerie Pitalo welcomed a baby girl.The 72 year old proud grandmother, who recently opened up on her strained relationship with Kris Jenner, took to her Instagram stories to share the happy news with her 12.6million followers. Reposting a photo of her grandson holding newborn Goldie Brooklyn in his arms, she wrote: "My 20th grandchild! @valeriepitalo @burtonjenner love you both!" Caitlyn's son Burton, 43, who she shares with ex Chrystie Scott, and his partner Valerie posted about their bundle of joy on their own accounts, where they announced their daughter was born on 19 March.