The Bruins lead the all-time series 44-20, but Oregon State has won the last two meetings.
Alleyne scored the last 10 points for Oregon and finished with 30 points and 25 rebounds.
The Bruins have won four in a row on the road in the Pac-12, dating back to last season.
Nirra Fields led UCLA with 19 points, but California used a 15-0 run to walk away with the victory.
The game will be televised live on the Pac-12 Networks and will air on AM 1150.
Nirra Fields led the Bruins with a game-high 22 points.
UCLA's Lindsey Pluimer recalls the Bruins' Pac-10 Tournament title over Stanford.
Bruin guard scored a career-high 23 points to help defeat USC on Sunday.
The UCLA women's basketball game vs. Stanford is Harry Potter night as well!
Freshman guard Jordin Canada earned Pac-12 Freshman of the Week honors after UCLA swept USC.
UCLA redshirt sophomore guard Kari Korver scored a career-high 23 points in the win.
The game will be televised live on the Pac-12 Networks and will hit the airwaves on AM 1150.