Messages were left on social media from those who watched the BBC One programme specially to see the singer join fellow-hosts Aled Jones and Pam Rhodes.
One user wrote on Twitter: "@KathJenkins never usually watch Songs of Praise but tuned in especially today. You were lovely and not to (sic) far from me in West Sussex."
Katherine Jenkins was announced as a new presenter for the show earlier this month.
@BBCSoP @KathJenkins I really enjoyed Songs of Praise last night! It's always nice to see a new presenter! God Bless you all!
— David Royle (@royle1957) July 24, 2017
Another said: "NEVER watch #SongsofPraise not being religious, however @KathJenkins is now a presenter & she's AMAZING, I'm a convert, can't wait 2C her soon."
The 37 year old was filmed visiting the seaside town of Hastings in East Sussex where she met church volunteers who help new mothers.
Someone tweeted: "You're a natural Katherine, I never usually watch SOP, but I made an exception today. And looking lovely as always."
Another said: "@KathJenkins Presenting so naturally on Songs of Praise - as if this show doesn't warm my heart enough already!"
Well done on Songs of Praise @KathJenkins If you are singing and presenting, I will continue to watch it
— Malcolm McEwen (@malcmc7) July 23, 2017
The Welsh mezzo-soprano also learned about the impact of the Battle of Hastings on the area and performed the hymn Jerusalem.
One message said: "@KathJenkins You were such a natural presenter Katherine, wonderful! Loved you performing 'Jerusalem', just BEAUTIFUL."
One tweeter, acknowledging they were not an "avid Songs of Praise watcher", said they were now "hooked" thanks to Jenkins joining the programme.