"Don't Go Breaking My Heart" - Mackenzie Phillips and Valerie Bertinelli

Mackenzie Phillips and Valerie Bertinelli performing "Don't Go Breaking My Heart" By Elton John and Kiki Dee

Season 2, Episode 12 - "Happy New Year"
First Aired: December 28, 1976

UPDATE:
[I see a lot of 'ignorant comments' about Mackenzie Phillips’s career and musical legacy, and I decided to leave a short informative update to bring her Baby Boomer "fans" up to speed.]
On Mackenzie Phillips's {Name Variants on her published works include: Laura McKenzie Phillips, Laura Mackenzie Phillips, Laura MacKenzie Phillips, MacKenzie Phillips
M. Phillips, MacKenzie, Mackenzie Phillips, McKenzie Phillips, Mack, (Molly Phillips)] musical legacy--

Actually she IS a singer, performer, musician, and song-writer... I am 33 and she is MY FAVOURITE SINGER! She has had a very loyal and dedicated fanbase and cult-following with Millennials, like myself for the last 20 years. She sang 3 seasons worth of original music as the character Molly Phillips on Disney's So Weird, [that is streaming on Disney+ NOW!] She also wrote a bunch of songs with her dad John Phillips as one of the new and last member's of The Mamas & the Papas during the latter years of the band's album releases and concert touring (mid 80's to early 90's). I'm a huge fan so forgive me as I continue...
She sang backup on her dad's album Pay, Pack & Follow, on her sister Bijou's album "I'd Rather Eat Glass" as well as Peter Tork's - "Stranger Things Have Happened". Interestingly enough, the only reason she got the role of Carol in American Graffiti [her break out role] was because an exec has seen her perform with her childhood band back when she was 14. She even recorded the song "Junk Food Junkie" with The Jackson 5 which was featured on their show 𝘛𝘩𝘦 𝘑𝘢𝘤𝘬𝘴𝘰𝘯𝘴 in 1976. She still writes music with her son Shane Barakan and recently had a performance at Agape International Spiritual Center in Beverly Hills, California. It's crazy to me that most fans from her breakout era know very little about her musical legacy. So far as thinking she hasn't made her mark like her two sisters and her parents did in the industry. It's actually quite far from the truth. She's a musical genius and an icon silently standing right along side her very musical family. Currently she is a drug and alcohol counselor at Breathe Life Health Center in Hollywood, and she is a co-host on her own recovery podcast called 𝘈𝘮𝘦𝘳𝘪𝘤𝘢 𝘙𝘦𝘤𝘰𝘷𝘦𝘳𝘴. New episodes are uploaded on iTunes and Spotify every Tuesday. FUN FACT: Her younger brother Tamerlane Phillips has also put out his own record in 2008 entitled 'Spiritual Blossoms' with Andru Cann. [Can you tell I'm a huge fan!?]