![The official announcement on the producer's instagram. The official announcement on the producer's instagram.](http://images6.fanpop.com/image/articles/247000/h2o-just-add-water_247339_top.png?cache=1436155948)
The official announcement on the producer's instagram.
"Welcome home to Mako...RIKKI! A very special guest star #makomermaids #H2OJustAddWater link
You will see some screenshots from his INSTAGRAM.
I"m so excited! Are YOU?
![Cariba's first official Instagram that's public. Cariba's first official Instagram that's public.](http://images6.fanpop.com/image/articles/247000/h2o-just-add-water_247339_1.png?cache=1436155970)
Cariba's first official Instagram that's public.
![Announcement with the mermaids tagged. Announcement with the mermaids tagged.](http://images6.fanpop.com/image/articles/247000/h2o-just-add-water_247339_2.png?cache=1436156177)
Announcement with the mermaids tagged.