It 's only logical that Kirstie Alley has been called out by Star Trek fans for paying tribute to the wrong Spock . The actress raised the heckles of Trekkies Sunday when she wrote a tribute on Twitter seemingly honoring a real-life celebrity child psychologist instead of the fictional science officer of USS Enterprise portrayed by the late actor Leonard Nimoy . 'Rest in peace Dr. Spock ... Xxxooo , ' Alley wrote in a message accompanying a black-and-white still photograph of Nimoy as the half-Vulcan first officer under the command of Captain James T. Kirk . Scroll down for video . Twitter gaffe : Kirstie Alley has been called out by Star Trek fans for calling Leonard Nimoy 's character 'Dr Spock ' instead of 'Mr Spock ' Wrong Spock : The actress ( left ) accidentally paid tribute to Dr Benjamin Spock ( right ) , a celebrity child psychoanalyst who died in 1998 . The vintage image also features a young Kirstie Alley as the Romulan Lieutenant Saavik , who appears to be going in for a kiss with Nimoy 's stone-faced Spock in the 1982 Star Trek : The Wrath of Khan . Alley was later replaced in the role by the actress Robin Curtis . The 64-year-old TV and film actress unwittingly eulogized Dr Benjamin Spock , a famed pediatric psychoanalyst and the author of the mega best-seller Baby and Child Care who passed away in 1998 at age 94 . Fans of the successful science fiction franchise Star Trek wasted no time pointing out Alley ’ s mistake . Co-stars : Kirstie Alley ( left ) played the Romulan Lieutenant Saavik in Star Trek : The Wrath of Khan alongside Nimoy as Spock ( right ) Brief sci-fi career : Alley ( left andf right ) was later replaced in the role by the actress Robin Curtis . Team Enterprise : Nimoy ( far right ) portrayed the half-Vulcan , half-human science officer Spock for 47 years . This file photo shows the cast of Star Trek : The Wrath of Khan , including William Shatner as Captain James T. Kirk ( center ) and Alley as Saavik ( second right ) 'That 's *Mr.* Spock . Dr. Spock was the baby expert , ' user Eric Fettmann reminded the Look Who 's Talking star . Another Star Trek fan Julie Smith wrote : 'ROFL Dr. Spock gave our parents advice about how to take care of us ! ' But others have come to Alley 's defense , insisting that the actress ' slip-up was just an innocent mistake . Alley , who was out of the country when Leonard Nimoy passed away Friday at age 83 , defiantly responded to the flurry of tweets about her gaffe about an hour later . Outspoken : Alley , 64 , has defended her tweet in a follow-up message , insisting that honorary titles notwithstanding , the sentiment was the same . Live Long and Prosper : Nimoy passed away Friday after a long battle with lung disease . He was 83 . ' I 'm sure Mr. Spock had PHD 's in Science ... anyway the sentiment is the same..jeez ... hard to make gestures on here without Trek police..RIP , ' she retorted . Nimoy , who played Mr Spock for 47 years , was laid to rest Sunday in Los Angeles following an intimate ceremony attended by family and close friends .
Alley , 64 , mixed up Nimoy 's Mr Spock with Dr Spock , calling to mind the late pediatric psychoanalyst and bestselling author Dr Benjamin Spock . Star Trek : Who 's Talking star appeared in The Look The Wrath of Khan , portraying Lt Saavik . Alley defended her message in a follow-up tweet , insisting that her gaffe notwithstanding , the sentiment was the same .