Actress Nicole Richie's hair catches fire while blowing out birthday candles

American actress and fashion designer Nicole Richie's hair caught fire while she was blowing out her 40th birthday candles. She posted a video of the accident on her Instagram and wrote, "Well...so far 40 is" with a fire emoji. The post received several comments from her friends including singer Katy Perry, who reacted by commenting, "WAIT NO WAY WAIT OMG."