Athina Onassis Roussel has been named the richest teen in the world, after receiving $1 billion when she turned 18 in 2003. Granddaughter of famous Aristotle Onassis celebrated her 20th birthday a month ago, and already is going to wed her recent boyfriend, Brazilian equestrian star Alfonso De Miranda Neto.

The oil heiress has been dating the 31-year-old Doda (his Brazilian nickname) for several years. After buying an apartment in Sao Paulo Athina is planning to tie the knot later this year. The pair is going to stay for some time in Brazil, and than go to Europe, The Scoop reports.

The only child of Christina Onassis was recently reported to spend lots of her time in Greece, because due to the will of her grandfather Aristotle she must learn his native language in order to receive an extra $2 billion.