Justin Timberlake celebrated his 26th birthday yesterday (31JAN07) with thousands of fans during a concert in Montreal, Canada. During the two-hour performance at Canada's Ball Centre, fans held up homemade "Happy Birthday" signs and twice spontaneously broke into HAPPY BIRTHDAY TO YOU between songs. Timberlake joked with the crowd, saying, "You guys are trying to say something to me, but I don't know what it is. This is the loudest crowd I've had so far." Hip-hop producer and rapper Timbaland, who worked with the star on his FUTURESEX/LOVESOUNDS album, toasted his pal with a shot of tequila onstage. After the final song, Timbaland presented the birthday boy with a cake, telling the crowd, "For y'all who don't know, this is my friend. It's not all about the music. I love this guy." The auditorium's video screens flashed the message "Happy Birthday Justin" while the crowd sang for him. The MY LOVE singer told the crowd, "Thank you very much. This has been a totally amazing evening. Thank you for making my 26th birthday so amazing."