The present invention relates to a composition comprising ex-vivo expanded adipose tissue derived stem cell (ASC) or ex-vivo expanded adipose tissue-derived stem cells (ASC) mixed with harvested fat tissue at a ratio of 5.0×104-2.0×108 ASCs/mL fat; for example 1.0×105-2.0×107 and the use of ex-vivo expanded adipose tissue-derived stem cells or ex-vivo expanded adipose tissue-derived stem cell enriched fat grafts as an agent for cosmetic breast filling/augmentation or for facial filling/reju-venation.