According to website ITV, the two young stars have been continuously spotted together, although they had a brief split in 2005.
Earlier this year, the Pirates of the Caribbean star gave his girlfriend a diamond sparkler valued at more than $100,000 US. The blonde actress also revealed that she hopes to one day marry her boyfriend.
Bloom and Bosworth met while filming a commercial for The Gap. They never worked together again after that ad.
Bosworth is currently starring in Superman Returns, and is being heavily recruited for films, which leaves not much time to concentrate on her love life, although she considers her relationship with Bloom to be one of the "most beautiful things in the world".