Britney Spears' emotional Christmas reunion, Mariah Carey's Santa moment top Hollywood's holiday celebrations

Hollywood's biggest names decked the halls with boughs of holly and enjoyed the Christmas holiday on Wednesday. 

For Britney Spears, it was an extra-special day, as she celebrated a long-awaited reunion with her youngest son, Jayden, 18, whom she says she hasn't seen in two years.

The pop star shared a video compilation of moments with Jayden on Instagram, writing in the caption, "Best Christmas of my life !!! I haven’t seen my boys in 2 years !!! Tears of joy and literally in shock everyday koo koo crazy so in love and blessed !