Yes, "Rock Star" is loosely based on the true story of Tim "Ripper" Owens, a singer who gained fame as the lead vocalist for the heavy metal band Judas Priest after starting as a tribute band singer. The film stars Mark Wahlberg as Chris Cole, a character inspired by Owens, portraying his journey from a passionate fan to fronting a famous rock band. While the plot has fictional elements, it draws on Owens' real-life experiences in the music industry, making it a narrative rooted in truth.

Yes, Mark Wahlberg sang in the movie "Rock Star." He portrayed Chris "Izzy" Cole, a lead singer of a rock band. While Wahlberg's singing was featured in several scenes, the actual vocals for the songs in the film were performed by Jeff Scott Soto, a professional singer who provided the singing voice for Wahlberg's character. The movie showcases a mix of original songs and covers, highlighting the rock music theme central to the story.

"Rock Star," released in 2001 and starring Mark Wahlberg and Jennifer Aniston, received mixed reviews from critics and had moderate box office success. With a production budget of around $50 million, it grossed approximately $19 million in the U.S., making it a commercial disappointment. However, it has gained a cult following over the years for its portrayal of the rock music scene and its nostalgic appeal. While it may not have been a hit financially, it has found appreciation among certain audiences.

As of October 2023, "Rock Star," starring Mark Wahlberg and Jennifer Aniston, is available for streaming on platforms like Amazon Prime Video and Hulu, among others. Availability can vary based on your region, so it's best to check these platforms directly to confirm if the movie is currently offered in your area.