Romeo Beckham's girlfriend Mia Regan playfully promotes his mum Victoria's beauty line by writing 'POSH' on her bikini-clad posterior By Ella Hodson For Mailonline Published: 18:01 GMT, 6 November 2021 | Updated: 18:08 GMT, 6 November 2021 Viewcomments Mia Regan sent temperatures soaring when she posted a bikini snap of herself to Instagram on Saturday. Posing in the sand, the 18-year-old model put her peachy bottom on display, with the word 'posh' written in blusher on it. Wearing a stringy pink thong bikini, she posted the cheeky snap to promote her boyfriend Romeo Beckham's mother's beauty line - Victoria Beckham Beauty. Cheeky! Mia Regan, 18, sent temperatures soaring when she posted a bikini snap of herself on Saturday, which showed off her peachy bottom She captioned the photo, which was to promote her boyfriend Romeo Beckham's mother Victoria's beauty line: 'blusher on the butt butt