Heather Rae El Moussa's birthday dinner was extra special this year. "Feeling so loved this birthday," El Moussa, 38, wrote via Instagram on Tuesday, September 16, alongside a photo of her entire blended family. "Spent the whole day surrounded by the people I love most My heart couldn't be more full." She added, "P.S. Tristan's reaction to the 'new addition' at dinner was priceless," seemingly referring to the teenage boy standing next to her stepdaughter, Taylor, 14, in the picture.