Question: What singer replaced Diana Ross as the lead singer of The Supremes in January of 1970 and provided the lead vocals on the song "You Gotta Have Love in Your Heart" by the Supremes and the Four Tops?
Context: Jean Terrell (born Velma Jean Terrell, November 26, 1944 in Belzoni, Mississippi) is an American R&B and jazz singer.  She replaced Diana Ross as the lead singer of The Supremes in January 1970. "After All" is a 1960 song written by Smokey Robinson and originally recorded and released by The Miracles on the Tamla label.  It was later covered as an unreleased single by The Supremes for Tamla; it was canceled in favor of the single "Buttered Popcorn", and their cover wasn't released until it appeared on the 2000 box set, "The Supremes".  The song is noted for both groups' unusual choices for leads.  For the Miracles' version it serves as a rare lead for Claudette Rogers Robinson, instead of the group’s main lead, Claudette's husband, Smokey Robinson.  In the Supremes' case it is their only single to feature Barbara Martin singing on lead vocals (although she does have a spoken line during the song "(He's) Seventeen").  Florence Ballard, Mary Wilson, and Diana Ross sing verses, and Martin sings the bridge (usually Ballard or Ross was given the lead on the group's recordings at that time).  "After All" was also later covered by The Marvelettes, in the early 1970s, with group member Wanda Young Rogers as lead.  (There's a connection to the two previous groups in that Wanda Young was the wife of Miracles member Bobby Rogers, and she was the only member of The Marvelettes on the song—as with the late-1960s singles of The Supremes, The Andantes served as background singers.)  Their version appears on the album "The Return of the Marvelettes", and later became the group's belated final single (it failed to chart). "Up the Ladder to the Roof" is a 1970 hit single recorded by The Supremes for the Motown label.  It was the first Supremes single to feature new lead singer Jean Terrell in place of Diana Ross, who officially left the group for a solo career two weeks before the recording of this song in January 1970.  This song also marks a number of other firsts: it is the first Supremes single since "The Happening" in 1967 to be released under the name "The Supremes" instead of "Diana Ross & the Supremes", the first Supremes single solely produced by Norman Whitfield associate Frank Wilson, and the first Supremes single to make the United Kingdom Top 10 since "Reflections" in 1967. "Stoned Love" is a 1970 hit single recorded by The Supremes for the Motown label.  It was the last "Billboard" Pop Top Ten hit for the group, peaking at number seven, and their last "Billboard" number-one R&B hit as well, although the trio continued to score top ten hits in the UK into 1972.  This single and "Up the Ladder to the Roof" are the only top-ten Supremes singles to feature Jean Terrell on lead vocals instead of Diana Ross, who left the group in January 1970 to pursue a solo career.  In the UK, it was the post-Ross Supremes' biggest hit, reaching number 3 in the singles chart.  The single spent six weeks in the UK top ten and five weeks in the US top ten. "Someday We'll Be Together" is a song written by Johnny Bristol, Jackey Beavers, and Harvey Fuqua and made popular as the last of twelve American number-one pop singles for Diana Ross & the Supremes on the Motown label.  Although it was released as the final Supremes song featuring Diana Ross, who left the group for a solo career in January 1970, it was recorded as Ross' first solo single and Supremes members Mary Wilson and Cindy Birdsong do not sing on the recording.  Both appear on the B-side, "He's My Sunny Boy." Farewell is a 1970 live album by Diana Ross & the Supremes.  The album was recorded over the course of the group's final engagement together at the New Frontier Hotel and Casino in Las Vegas, Nevada, including the final night on January 14, 1970.  The show marked Diana Ross' penultimate performance with fellow Supremes members Mary Wilson and Cindy Birdsong.  At the conclusion of the show, new Supremes lead singer Jean Terrell was brought onstage and introduced to the audience. Diana Ross & the Supremes: Greatest Hits Vol.  3 is a 1969 compilation album by Diana Ross & the Supremes, released on the Motown label.  It features all of the hits released by the group between 1967 and 1969 save for the Supremes/Temptations duet singles.  After Florence Ballard's mid-1967 departure from the group, Supremes singles were recorded by Diana Ross with session singers The Andantes on backgrounds instead of new Supreme Cindy Birdsong and founding member Mary Wilson, including "Love Child" and "Someday We'll Be Together" (Birdsong's voice in fact does not appear on this album). "You Gotta Have Love in Your Heart" is a duet single between Motown singing groups The Supremes and the Four Tops, released as a single from their "The Return of the Magnificent 7" album in 1971.  The single became a modest charter peaking at #55 on the U.S. "Billboard" Hot 100 chart and #41 on the U.S. "Billboard" R&B Singles Chart.  The single fared better in the UK, where it reached #25 in the official top 50 single chart.  Lead vocals were by the groups' respective lead singers Jean Terrell and Levi Stubbs. The Return of the Magnificent Seven is the second collaborative album between Motown label-mates The Supremes and Four Tops, released in 1971.  The production only featured two covers compared to their first album together, "The Magnificent 7", that included more than eight.  Although the three albums the Supremes recorded with the Four Tops did not match the commercial success of the Supremes/Temptations duet albums (ironically loaded with covers), what they did have instead were original tunes, soulful lead vocals by Jean Terrell and Levi Stubbs and high production values in terms of arrangements and orchestration. Diana Ross & the Supremes: Greatest Hits (also released as The Supremes: Greatest Hits) is a two-LP collection of singles and b-sides recorded by The Supremes, released by Motown in August 1967 (see 1967 in music).  The collection was the first LP to credit the group under the new billing "Diana Ross & the Supremes".  Although founding member Florence Ballard is pictured on all album artwork and sings on all the tracks, by the time the set was released, she had been fired from the group and replaced by Cindy Birdsong.
Answer: Jean Terrell