Larissa Costa Silva de Oliveira was born in Natal, Rio Grande do Norte, Brazil. She is 5’91⁄2” tall.
On May 9, 2009, Costa represented Rio Grande do Norte at Miss Brazil 2009 and competed against 26 other candidates at the Memorial da América Latina Complex in São Paulo, Brazil. She won the title.
On August 23, 2009, Costa represented Brazil at Miss Universe 2009 and competed against 82 other candidates at the Imperial Ballroom on Atlantis Paradise Island in Nassau, Bahamas. She was unplaced.
On March 8, 2010, Costa went back to São Paulo and crowned Debora Lyra as the next Miss Brazil. On March 9, 2010, Miss Brazil 2009 turned 26.
Miss Brazil 2010
- beauty pageant: Miss Brazil
- edition: 56th
- international membership: Miss Universe
- venue: Memorial da América Latina, São Paulo, Brazil
- date: May 8, 2010
- candidates: 27
FINALISTS
| PLACEMENT | CANDIDATE (HOMETOWN) |
| Top 15 | Rafaela Marques (Bahia) Francienne Pavesi (Espirito Santo) Kátia Talon (Mato Grosso do Sul) Salcy Lima (Para) Karla Mandro (São Paulo) |
| Top 10 | Juliete de Pieri (Mato Grosso) Thamíres Flazake (Rio de Janeiro) Bruna Jaroceski (Rio Grande do Sul) Nayane Pacheco (Sergipe) Suymara Barreto (Tocantins) |
| Top 5 | Lilian Lopes Pereira (Amazonas) Lidiane Matos (Distrito Federal) Debora Moura Lyra (Minas Gerais) Natalia Taveira (Paraiba) Marylia Bernardt (Parana) |
WINNERS
| PLACEMENT | 2010 | 2009 |
| 4th runner-up | Natalia Taveira Paraiba | Khrisley Karle Ceara |
| 3rd runner-up | Lidiane Matos Distrito Federal | Rayana Breda Para |
| 2nd runner-up | Marylia Bernardt Parana | Denise Ribeiro Distrito Federal |
| 1st runner-up | Lilian Lopes Pereira Amazonas | Rayanne Moraes Minas Gerais |
| Miss Brazil Miss Universe Brazil | Debora Moura Lyra Minas Gerais | Larissa Costa Rio Grande do Norte |
Ribeiro is Miss American Continent Brazil 2009. Moraes is Miss International Brazil 2009.
