The 29-year-old joins the Hammers on a six-month loan move from Brazilian side Cruzeiro, with the Premier League side able to acquire the striker on a three-year permanent deal.
West Ham has completed the signing of Cruzeiro forward Wellington Paulista on a six-month loan deal.
The 29-year-old striker makes the move from South America with the option of a three-year permanent deal come the summer, and he becomes the second attacking reinforcement of the transfer window following the loan acquisition of Marouane Chamakh from Arsenal.
Paulista has revealed his pleasure at completing his transfer to London, but was also keen to state his desire to prove himself.
"I am really happy to be here at West Ham," he told the club’s official website. "Everyone has been very kind to me since I have been at the club this week. I think I can do my best here and I am coming to England to prove to everyone that I am one of the best strikers in Brazil and to get better and better."
Joint-chairman David Sullivan welcomed Paulista to Upton Park, adding that the Brazilian can go on to prove to be an "excellent acquisiton" for the club.
"He is another exciting player to add to our squad and although he may not be that well known on these shores, he comes with an excellent track record in Brazil," Sullivan said. "His arrival is similar to some of the other 'wildcard' players we have signed before like in Demba Ba and Ilan. They both made significant contributions and if he can match their efforts he will be an excellent acquisition for West Ham."
Paulista has enjoyed a prolific career across Brazil and also had a spell in Europe with Spanish side Alaves.